1. Halides of the phosphorus group elements (P, As, Sb, Bi)
2. Ionic and molecular halides of the phosphorus family
3. Brit. Pat. 734187 (27. Juli 1955), Ministry of Supply, London. Erf.: u. .
4. US.-Pat. 2853515 (23. Sept. 1958), Ministry of Supply, London, Erf.: u. .