Barkan Ugurlu Ioannis Havoutis Claudio Semini Kana Kayamori Darwin G. Caldwell Tatsuo Narikiyo Pattern generation and compliant feedback control for quadrupedal dynamic trot-walking locomotion: experiments on RoboCat-1 and HyQ. 415-437 2015 38 Auton. Robots 4 https://doi.org/10.1007/s10514-015-9422-7 db/journals/arobots/arobots38.html#UgurluHSKCN15