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2 matching references were found.
Bergman; Engel, E.L.; Wolff, H.A., Z. Phys. Chem., Abt. B, 1932, 17, 81. [all data]
Bergmann, E.D.; Engel, L.; Wolff, H.A., Dipole measurements in the diphenylmethane and triphenylmethane series, Z. Phys. Chem., Abt. B, 1931, 17, 81. [all data]