@article {2182,
	title = {Comparative placentation},
	year = {2004},
	publisher = {University of California, San Diego, School of Medicine]},
	address = {[San Diego, Calif},
	keywords = {Anatomy, Comparative, Placenta},
	url = {http://placentation.ucsd.edu/homefs.html},
	author = {Benirschke, Kurt}
}
