Levashova, V. I.; Krasnov, V. A.; Bunina-Krivorukova, L. I.
Journal of Organic Chemistry USSR (English Translation), 1989 , vol. 25, # 7.2 p. 1319 - 1321
Zhurnal Organicheskoi Khimii, 1989 , vol. 25, # 7 p. 1463 - 1465