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Ofner
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Ponzio; Valente
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Flaschner
Monatshefte fuer Chemie, vol. 26, p. 1071
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Ofner
Monatshefte fuer Chemie, vol. 25, p. 602
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Paal; Bodwig
Chemische Berichte, vol. 25, p. 2899

Flaschner
Monatshefte fuer Chemie, 1905 , vol. 26, p. 1076