1. Belousov, Yu.B. and Ushkalova, E.A., Antibiot. Khimioter., 2001, vol. 46, no.11, p. 23.
2. Evangelista, R. and Schapoval, E., Rev. Cienc. Farm., 1983, no. 5, p. 17.
3. Mukhamedzyanov, R.M. and Likhoed, V.A., Antibiot. Khimioter., 1991, vol. 36, no.7, p. 14.
4. Siplivaya, L.E., Shevtsova, E.M., Lazarev, A.I., and Prokopenko, L.G., Antibiot. Khimioter., 1999, vol. 44, no.2, p. 29.
5. Sampath, S. and Robinson, D., J. Pharm. Sci., 1990, no. 5, p. 428.