Powell; Wasserman
Journal of the American Chemical Society, 1957 , vol. 79, p. 1934,1938
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Timmons
Journal of the Chemical Society, 1957 , p. 2613,2614
Stevens
Journal of the American Chemical Society, 1935 , vol. 57, p. 1115
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Stevens
Journal of the American Chemical Society, 1934 , vol. 56, p. 1425
Journal of the American Chemical Society, 1935 , vol. 57, p. 1112,1115