1. Erkhitueva, E.B., Dogadina, A.V., Khramchikhin, A.V., and Ionin, B.I., Zh. Obshch. Khim., 2011, vol. 81, no. 11, p. 1925.
2. Erkhitueva, E.B., Dogadina, A.V., Khramchikhin, A.V., and Ionin, B.I., Tetrahedron Lett., 2012, vol. 53, no. 33, p. 4304.
3. Petrov, A.A., Dogadina, A.V., Ionin, B.I., Garibina, V.A., and Leonov, A.A., Usp. Khim., 1983, vol. 52, no. 10, p. 1793.