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Ponzio; Valente Gazzetta Chimica Italiana, vol. 38, p. I, 522 Full Text Show Details Flaschner Monatshefte fuer Chemie, vol. 26, p. 1071 Full Text Show Details Ofner Monatshefte fuer Chemie, vol. 25, p. 602 Full Text Show Details Paal; Bodwig Chemische Berichte, vol. 25, p. 2899