[5] Ann. 148, 242 (1868).
[6] Ann. 308, 318 (1899).
[7] J. Russ. Phys. Chem. Soc. 42, 1387 (1910); Chem. Zentr. 1911 (I) 1279.
[8] Ann. 378, 263 (1911).
[9 Ber. 21, 534 (1888); J. prakt. Chem. (2) 81, 384 (1910).
[10] Ber. 27, (1894).
[11] Ber. 31, 3163 (1898)
[12] Inaugural Dissertation of A. Kohler (1909), Univ. of Bern.