@article {raviv2007microtubule,
	title = {Microtubule protofilament number is modulated in a stepwise fashion by the charge density of an enveloping layer},
	journal = {Biophysical journal},
	volume = {92},
	year = {2007},
	pages = {278{\textendash}287},
	publisher = {Elsevier},
	author = {Raviv, Uri and Nguyen, Toan and Ghafouri, Rouzbeh and Needleman, Daniel J and Li, Youli and Miller, Herbert P and Wilson, Leslie and Bruinsma, Robijn F and Safinya, Cyrus R}
}
