Trudy Leningradsk. chim. technol. Inst.Chem.Abstr., , # 10 p. 3,6 Trudy Leningradsk. chim. technol. Inst.Chem.Abstr., , p. 1507 Collection of Czechoslovak Chemical Communications, , vol. 18, p. 870,874 Chem.Abstr., , p. 12302 Journal of the Chemical Society, , p. 313 Journal of the Chemical Society, , p. 5041 Chemicke Listy, , vol. 46, p. 762,764 Collection of Czechoslovak Chemical Communications, , vol. 18, p. 870,876 Chem.Abstr., , p. 12302