Hovorka, V. Collection of Czechoslovak Chemical Communications, 1932 , vol. 4, p. 302 - 302 Full Text Show Details Hovorka, V. Collection of Czechoslovak Chemical Communications, 1932 , vol. 4, p. 305 - 305 Full Text Show Details Hovorka, V. Collection of Czechoslovak Chemical Communications, 1932 , vol. 4, p. 318 - 318 Full Text Show Details Gmelin Handbook: Se: MVol.B, 29, page 61 - 64