1. Khachikyan, R.Dzh., Kotikyan, S.Yu., and Agbalyan, S.G., Khim. Zh. Armenii, 1999, vol. 52, p. 90.
2. Khachatryan, R.A., Khachikyan, R.Dzh., Zalnyan, S.A., Gevorgyan, G.A., Karamyan, N.V., and Indzhikyan, M.G., Khim. Zh. Armenii, 2001, vol. 54, nos.3–4, p. 61.
3. Gandlano, G., Mondelli, R., Pontu, P.P., Ticcori, C., and Umani-Ronchi, A., J. Org. Chem., 1968, vol. 33, no.12, p. 4431.
4. Horner, L., Beck, P., and Hoffman, H., Chem. Ber., 1959, vol. 92, no.9, p. 2088.
5. Khachatryan, R.A., Khachikyan, R. Dzh., Karamyan, N.V., and Indzhikyan, M.G., Khim. Geterotsikl. Soedin., 2004, no. 4, p. 54.