@article {18,
	title = {Community Size and Network Closure},
	journal = {American Economic Review Papers and Proceedings},
	volume = {97},
	number = {2},
	year = {2007},
	pages = {80-85},
	url = {http://www.jstor.org/stable/30034425},
	author = {Hunt Allcott and Dean Karlan and Markus Mobius and Tanya Rosenblat and Adam Szeidl}
}
