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 ## Good to start
 - [Quadruped Robot Basics](https://youtu.be/O_2swSMecB4)
+- [Development of quadruped walking robots: A review](https://doi.org/10.1016/j.asej.2020.11.005)
 
 ## Quadrupedal Robots
 > Alphabetical order
-- AiDIN
-- ANYmal
-- Cheetah
-- HyQ
-- Spot
-- Unitree
+- [AiDIN](https://www.aidinrobotics.co.kr/leggedrobot-aidin)
+- [ANYmal](https://rsl.ethz.ch/robots-media/anymal.html)
+- [Cheetah](https://biomimetics.mit.edu/)
+- [HyQ](https://robots.ieee.org/robots/hyq/)
+- [Spot](https://www.bostondynamics.com/products/spot)
+- [Unitree](https://www.unitree.com/)
 
 ## Papers
--  
+`It could include abroad keywords related to quadrupedal walking robots, e.g. control methods or reinforcement learning`
+
+> 2022
+- [Advanced Skills through Multiple Adversarial Motion Priors in
+Reinforcement Learning](https://doi.org/10.48550/arXiv.2203.14912)
+- [Learning robust perceptive locomotion for quadrupedal robots in the wild](https://doi.org/10.1126/scirobotics.abk2822)
+- [Learning Torque Control for Quadrupedal Locomotion](https://doi.org/10.48550/arXiv.2203.05194)
+- [Safe Reinforcement Learning for Legged Locomotion](https://doi.org/10.48550/arXiv.2203.02638)
+- [Concurrent Training of a Control Policy and a State Estimator for Dynamic and Robust Legged Locomotion](https://doi.org/10.1109/LRA.2022.3151396)
+- [Learning Forward Dynamics Model and Informed Trajectory Sampler for Safe Quadruped Navigation](https://doi.org/10.48550/arXiv.2204.08647)
+- [PSTO: Learning Energy-Efficient Locomotion for Quadruped Robots](https://doi.org/10.3390/machines10030185)
+
+> 2021
+- [Development of a Quadruped Robot System With Torque-Controllable Modular Actuator Unit](https://doi.org/10.1109/TIE.2020.3007084)
+- [Adaptive CLF-MPC With Application to Quadrupedal Robots](https://doi.org/10.1109/LRA.2021.3128697)
+- [Cat-Like Jumping and Landing of Legged Robots in Low Gravity Using Deep Reinforcement Learning](https://doi.org/10.1109/TRO.2021.3084374)
+- [Imitation Learning from MPC for Quadrupedal Multi-Gait Control](https://doi.org/10.1109/ICRA48506.2021.9561444)
+- [Learning Agile Locomotion Skills with a Mentor](https://doi.org/10.1109/ICRA48506.2021.9561567)
+- [Learning Fast Adaptation with Meta Strategy Optimization](https://doi.org/10.48550/arXiv.1909.12995)
+- [Learning to Navigate Sidewalks in Outdoor Environments](https://doi.org/10.48550/arXiv.2109.05603)
+- [Learning to Walk in Minutes Using Massively Parallel Deep Reinforcement Learning](https://doi.org/10.48550/arXiv.2109.11978)
+- [Legged Robots that Keep on Learning: Fine-Tuning Locomotion Policies in the Real World](https://doi.org/10.48550/arXiv.2110.05457)
+- [Reinforcement Learning with Evolutionary Trajectory Generator: A General Approach for Quadrupedal Locomotion](https://doi.org/10.48550/arXiv.2109.06409)
+- [RMA: Rapid Motor Adaptation for Legged Robots](https://doi.org/10.48550/arXiv.2107.04034)
+- [VILENS: Visual, Inertial, Lidar, and Leg Odometry for All-Terrain Legged Robots](https://doi.org/10.48550/arXiv.2107.07243)
+- [Learning Vision-Guided Quadrupedal Locomotion End-to-End with Cross-Modal Transformers](https://doi.org/10.48550/arXiv.2107.03996)
+- [Minimizing Energy Consumption Leads to the Emergence of Gaits in Legged Robots](https://doi.org/10.48550/arXiv.2111.01674)
+- [Learning multiple gaits of quadruped robot using hierarchical reinforcement learning](https://doi.org/10.48550/arXiv.2112.04741)
+- [Imitation Learning by Reinforcement Learning](https://doi.org/10.48550/arXiv.2108.04763)
+
+> 2020
+- [Learning quadrupedal locomotion over challenging terrain](https://doi.org/10.1126/scirobotics.abc5986)
+- [Multi-expert learning of adaptive legged locomotion](https://doi.org/10.1126/scirobotics.abb2174)
+- [Learning Agile Robotic Locomotion Skills by Imitating Animals](https://doi.org/10.48550/arXiv.2004.00784)
+- [Rapidly Adaptable Legged Robots via Evolutionary Meta-Learning](https://doi.org/10.48550/arXiv.2003.01239)
+- [Reinforcement learning for quadrupedal locomotion with design of continual–hierarchical curriculum](https://doi.org/10.1016/j.engappai.2020.103869)
+- [Guided Constrained Policy Optimization for Dynamic Quadrupedal Robot Locomotion](https://ieeexplore.ieee.org/abstract/document/9028178)
+- [One Policy to Control Them All: Shared Modular Policies for Agent-Agnostic Control](https://doi.org/10.48550/arXiv.2007.04976)
+- [Models, Pixels, and Rewards: Evaluating Design Trade-offs in Visual Model-Based Reinforcement Learning](https://doi.org/10.48550/arXiv.2012.04603)
+- [Plane-based stairway mapping for legged robot locomotion](https://doi.org/10.1108/IR-09-2019-0189)
+
+> 2019
+- [DeepGait: Planning and Control of Quadrupedal Gaits using Deep Reinforcement Learning](https://doi.org/10.48550/arXiv.1909.08399)
+- [Design a Fall Recovery Strategy for a Wheel-Legged Quadruped Robot Using Stability Feature Space](https://doi.org/10.1109/ROBIO49542.2019.8961722)
+- [Dynamic Locomotion on Slippery Ground](https://doi.org/10.1109/LRA.2019.2931284)
+- [Fast and Continuous Foothold Adaptation for Dynamic Locomotion Through CNNs](https://doi.org/10.1109/LRA.2019.2899434)
+- [Feedback MPC for Torque-Controlled Legged Robots](https://doi.org/10.1109/IROS40897.2019.8968251)
+- [Stabilizing Off-Policy Q-Learning via Bootstrapping Error Reduction](https://doi.org/10.48550/arXiv.1906.00949)
+- [Robust Legged Robot State Estimation Using Factor Graph Optimization](https://doi.org/10.1109/LRA.2019.2933768)
+- [Learning agile and dynamic motor skills for legged robots](https://www.science.org/doi/10.1126/scirobotics.aau5872)
+
+> 2018
+- [MIT Cheetah 3: Design and Control of a Robust, Dynamic Quadruped Robot](https://doi.org/10.1109/IROS.2018.8593885)
+- [Policy Transfer with Strategy Optimization](https://doi.org/10.48550/arXiv.1810.05751)
+- [Sim-to-Real: Learning Agile Locomotion For Quadruped Robots](https://doi.org/10.48550/arXiv.1804.10332)
+- [Learning to Walk via Deep Reinforcement Learning](https://doi.org/10.48550/arXiv.1812.11103)
+
+> 2017
+- [Meta Learning Shared Hierarchies](https://doi.org/10.48550/arXiv.1710.09767)
+
+> 2016
+- [ANYmal - a highly mobile and dynamic quadrupedal robot](https://doi.org/10.1109/IROS.2016.7758092)
+
+> 2014
+- [Robot-Centric Elevation Mapping with Uncertainty Estimates](https://doi.org/10.1142/9789814623353_0051)
+
+> 2013
+- [State Estimation for Legged Robots - Consistent
+Fusion of Leg Kinematics and IMU](https://doi.org/10.7551/mitpress/9816.001.0001)
+
+> 2011
+- [Design of HyQ – a hydraulically and electrically actuated quadruped robot](https://doi.org/10.1177/0959651811402275)
+
+> 2008
+- [(KR)The Energy Efficiency of Walking Method for Quadruped Walking Robot](https://scienceon.kisti.re.kr/srch/selectPORSrchArticle.do?cn=NPAP08168696&dbt=NPAP)
+
+> 2005
+- [Slip Detection and Recovery for Quadruped Robots](https://doi.org/10.1016/j.robot.2005.07.002)
 
 ## Github Repositories
-- https://github.com/AtsushiSakai/PythonRobotics
 
-## Videos
-- [Cat-like Jumping and Landing of Legged Robots in Low-gravity](https://youtu.be/KQhlZa42fe4) 
+- https://github.com/michiganrobotics/rob101
+- https://github.com/michiganrobotics/rob501
+- https://github.com/leggedrobotics/rsl_rl
+- https://github.com/erwincoumans/pybullet_robots
+- https://github.com/leggedrobotics/legged_gym
+- https://github.com/AtsushiSakai/PythonRobotics
+- https://github.com/bulletphysics/bullet3/tree/master/examples/pybullet/gym/pybullet_envs/minitaur
 
-## Articles
-- https://spectrum.ieee.org/mini-cheetah-robots-feline-skills
+## Youtube Channels
+- [ANYbotics](https://www.youtube.com/channel/UC1B-ML60I2hKTvygvMjubnw)
+- [Oxford Dynamic Robot Systems Group](https://www.youtube.com/channel/UCaiUvr8geeebTWtEcQgUzpw) 
+- [Biomimetics MIT](https://www.youtube.com/user/MITbiomimetics)
+- [Boston Dynamics](https://www.youtube.com/user/BostonDynamics)
+- [cmurobotics](https://www.youtube.com/user/cmurobotics/featured)
+- [Conference on Robot Learning](https://www.youtube.com/channel/UCXnxdtIKJVUN0I-gKo2Chmg)
+- [DeepMind](https://www.youtube.com/channel/UCP7jMXSY2xbc3KCAE0MHQ-A)
+- [DeepRobotics](https://www.youtube.com/channel/UCj73fOsxOlugnBPJOoM9rHw)
+- [Erwin Coumans](https://www.youtube.com/user/erwincoumans)
+- [ETH Zürich](https://www.youtube.com/user/ethzurich)
+- [KAIST Urban Robotics Lab](https://www.youtube.com/user/urobotkaist)
+- [MIT Robotics](https://www.youtube.com/channel/UCK2tKzmSFFnpFhUXtRKjvnQ)
+- [Northwestern Robotics](https://www.youtube.com/user/kevinl2145)
+- [PRO ROBOTS](https://www.youtube.com/channel/UCu8luTDe_Xxd2ahAXsCWX5g)
+- [RaiLab Kaist](https://www.youtube.com/channel/UC2kxDvHbUj-nQlUMw09ih0Q)
+- [RcLab](https://www.youtube.com/channel/UCCDU6dQ7FDBjOTlkAuHQ21g)
+- [Reinforcement Learning Zurich](https://www.youtube.com/channel/UCml6vXgE_n2XdhONgSnkPFw)
+- [Robotics Innovatory](https://www.youtube.com/channel/UCgswqO84K3B2tMUdecHBuJQ)
+- [Robotics Today](https://www.youtube.com/channel/UCtfiXX2nJ5Qz-ZxGEwDCy5A)
+- [The Robot Brains Podcast](https://www.youtube.com/channel/UCXNviQjBONXljxkJzNV-Xbw)
+- [umrobotics](https://www.youtube.com/channel/UC-WH2n-SkB166pUq5o5ULUg)
+- [Unitree Robotics](https://www.youtube.com/channel/UCsMbp4V8oxzHCMdOUP-3oWw)
 
 ## Labs
 > Alphabetical order
-- []()
+- [Biomimetic Robotics Lab - MIT](https://biomimetics.mit.edu/)
+- [Dynamic Legged Systems Lab - Istituto Italiano di Tecnologia](https://www.iit.it/web/dynamic-legged-systems)
+- [Dynamic Robot Systems Group - University of Oxford](https://ori.ox.ac.uk/labs/drs/)
+- [RAI Lab - KAIST](https://www.railab.kaist.ac.kr/)
+- [RcLab - Kookmin University](https://rclab.kookmin.ac.kr/home)
+- [Robotic System Lab - ETH Zürich](https://rsl.ethz.ch/)
+- [Robotics Innovatory - SungKyunKwan University](https://mecha.skku.ac.kr/roboticsinnovatory/index.do)
+