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Published in Contributions in Science (Los Angeles), in 1985, in volume 356, pages 1-22
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Published in Contributions in Science Los Angeles, in 1961, in volume 41, pages 1-27
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Published in Arnaldoa, in 2009, in volume 16, issue 1, pages 93-103
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Published in Pacific Science, in 1967, in volume 21, issue 4, pages 474-485
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