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Schaarschmidt; Stahlschmidt
Chemische Berichte, 1912 , vol. 45, p. 3454
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Locher; Fierz
Helvetica Chimica Acta, 1927 , vol. 10, p. 654
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Eder; Widmer; Buetler
Helvetica Chimica Acta, 1924 , vol. 7, p. 354