1. “Phosphorus-Nitrogen Compounds”;ALLCOCK,1972
2. “Phosphorus-Nitrogen Chemistry, Chapter 5;NIELSEN,1966
3. “Phosphorus-Nitrogen Chemistry”;FLUCK;Topics.Phos.Chen.,1967
4. “Properties of the PN Bond”;HATHIS;PS,1976
5. “Amido ε Imido Phosphoric Acids ε their Salts”;PALGRAVE,1971