@article{Cohen1983,
	title = {Friction in the trading process and the estimation of systematic
	risk},
	author = {Kalman J. Cohen and Gabriel A. Hawawini and Steven F. Maier and Robert A. Schwartz and David K. Whitcomb},
	journal = {Journal of Financial Economics},
	month = {Aug},
	number = {2},
	pages = {263--278},
	url = {http://www.sciencedirect.com/science/article/B6VBX-46922FH-6/1/d50168732b88566775aa75d63e8a756d},
	volume = {12},
	year = {1983},
	biburl = {http://www.bibsonomy.org/bibtex/21e57bdd402640d183d54efce98b3d9ae/smicha},
	keywords = {imported }
}