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|SP||67.4 (Oct. 1992): 1003-1007||http://links.jstor.org/sici?sici=0038-7134%28199210%2967%3A4%3C1003%3A%3E2.0.CO%3B2-7|
|AHR||96.5 (Dec. 1991): 1518||http://links.jstor.org/sici?sici=0002-8762%28199112%2996%3A5%3C1518%3ATCATWW%3E2.0.CO%3B2-W|
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