Ruzicka; Hofmann; Schellenberg
Helvetica Chimica Acta, 1936 , vol. 19, p. 1391,1399
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Ruzicka; Hoesli; Hofmann
Helvetica Chimica Acta, 1936 , vol. 19, p. 370,372
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Ruzicka; Hofmann; Frei
Helvetica Chimica Acta, 1936 , vol. 19, p. 386
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Ruzicka et al.
Helvetica Chimica Acta, 1932 , vol. 15, p. 1496,1506