2Knut A,Jaeggi Basel,Leo Widler.Substituted Aikanediphosphonic Acid and Pharmaceutical Use[].USl l.989
3Tetsuhide Kamijo,Ryoji Yamamoto,Hiromu Harada.An Improved and Convenient Procedure for the Synthesis of 1-Substituted Imidazoles[].Chemical and Pharmaceutical Bulletin.1983