1. Antbick, O.: Ber. 20, 310 (1889); C. 1887, 466.
2. Bertrand: Compt. Rend. 128, 743 (1899).
3. Compt. rend. 128, 742 (1899).
4. Briggs, S. H. Clifford: Journ. Chem. Soe. London 117, 1026; C. 1921 1, 75.
5. Caille, E., U. E. Viel: C. R. D. 176, 1156 (1923); C. 1924 I, 1422.