@booklet {braun2018positive,
	title = {Positive{\textendash}negative stiffness actuators},
	journal = {IEEE Transactions on Robotics},
	volume = {35},
	number = {1},
	year = {2018},
	pages = {162{\textendash}173},
	publisher = {{IEEE} \},
	author = {Braun, David J and Chalvet, Vincent and Dahiya, Abhinav}
}
