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Greenwood, M. 1941: [Pearl, R.] Nature, London 147, S. 140, B15 11653
Greenwood, M. 1941: [Pearl, R.] Ecology, a publication of the Ecological Society of America, Brooklyn, N. Y. 22, S. 408, B15 10595
Miner, J. R. (et al.) 1941: [Pearl, R.] Scientific Monthly 52, S. 142-144
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