RH Wiley & P Wiley, Pyrazolones, Pyrazolidens & derivatives (John wiley, New York), 1964.
Rishiram Prajuli , Janmajoy Banerjee and Hemant Khanal ,Oriental journal of Chemistry,31(2015)04
F.R. Ruan Fu F & JJ Mao, J radioanal nucl. Chem. Lett, 199 (1987) 297.