Alekseev, Yu. I.; Pashkevich, D. S. Russian Journal of Applied Chemistry, 1993 , vol. 66, # 10.2 p. 1794 - 1797 Zhurnal Prikladnoi Khimii (Sankt-Peterburg, Russian Federation), 1993 , vol. 66, # 10 p. 2354 - 2358