@article {Loh:1998:1090-5138:397,
	author = "Loh C.Y. and Elliott J.M.",
	title = "Cooperation and Competition as a Function of Zygosity in 7- to 9-Year-Old Twins - a comparison of Anglo-American and Chinese children",
	journal = "Evolution and Human Behavior",
	volume = "19",
	number = "6",
	year = "1998",
	abstract = "",
	pages = "397-411",
	url = "http://www.ingentaconnect.com/content/els/10905138/1998/00000019/00000006/art00034",
	doi = "doi:10.1016/S1090-5138(98)00034-8",
	keyword = "Children, Competition, Cooperation, Dominance, Reciprocal Altruism, Singapore, Twins, Zygosity"
}