Vereshchagin, L. I.; Nikitin, V. M.; Meshcheryakov, V. I.; Gareev, G. A.; Kirillova, L. P.; Shul'gina, V. M. Journal of Organic Chemistry USSR (English Translation), 1989 , vol. 25, # 8.2 p. 1574 - 1577 Zhurnal Organicheskoi Khimii, 1989 , vol. 25, # 8 p. 1744 - 1747