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| Author: | Helfenstein |
2 matching references were found.
Karrer, P.; Helfenstein; Pieper; Wettstein, A., Helv. Chim. Acta, 1931, 14, 435. [all data]
Karrer; Helfenstein; Widmer, Helv. Chim. Acta, 1928, 11, 1201. [all data]