@article {1444817,
	title = {A soft ring oscillator},
	journal = {Science Robotics},
	volume = {4},
	number = {31},
	year = {2019},
	author = {Preston, D.J. and Jiang, H.J. and V. Sanchez and Rothemund, P. and Rawson, J. and Nemitz, M.P. and W. Lee and Z. Suo and C. J. Walsh and Whitesides, G. M.}
}
