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- DOI:
http://dx.doi.org/10.1111/j.1096-3642.1957.tb00286.x
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http://dx.doi.org/10.1111/j.1096-3642.1916.tb02014.x
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http://dx.doi.org/10.1111/j.1096-3642.1921.tb03274.x
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http://dx.doi.org/10.1111/j.1096-3642.1935.tb01687.x
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