@article {250961,
	title = {Microfluidic Printheads for Multimaterial 3D Printing of Viscoelastic Inks},
	journal = {Advanced Materials},
	volume = {27},
	year = {2015},
	pages = {3279{\textendash}3284},
	author = {J. O. Hardin and T. J. Ober and A. D. Valentine and J.A. Lewis}
}
