Levashova, V. I.; Krasnov, V. A.; Bunina-Krivorukova, L. I., Journal of Organic Chemistry USSR (English Translation), 1991, vol. 27, # 2.2, p. 310 - 313
Levashova, V. I.; Krasnov, V. A.; Bunina-Krivorukova, L. I., Journal of Organic Chemistry USSR (English Translation), 1991, vol. 27, # 2.2, p. 310 - 313