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DEWEY DOUGLAS R., 1961, CROP SCI, V1, P249, DOI 10.2135/cropsci1961.0011183X000100040006x
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KNOWLES R. P., 1955, CANADIAN JOUR BOT, V33, P534, DOI 10.1139/b55-043
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SARKAR P., 1956, CANADIAN JOUR BOT, V34, P328, DOI 10.1139/b56-026
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