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|AHR||98.3 (jun. 1993): 846-847||http://links.jstor.org/sici?sici=0002-8762%28199306%2998%3A3%3C846%3ATOVCMI%3E2.0.CO%3B2-7|
|SP||68.3 (Jul. 1993): 715-717||http://links.jstor.org/sici?sici=0038-7134%28199307%2968%3A3%3C715%3ATOVCMI%3E2.0.CO%3B2-J|
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