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Journal of the American Chemical Society, 1945 , vol. 67, p. 832,835
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Fleck et al.
Helvetica Chimica Acta, 1950 , vol. 33, p. 130,136
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Borrows; Hems
Journal of the Chemical Society, 1945 , p. 577
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Foeldi et al.
Journal of the Chemical Society, 1948 , p. 1295,1298