Vestnik of
Samara State University
2003, 2-nd S.I.
2004, No. 2
2004, S.I.
2005, No. 5
2006, No. 4
2006, No. 6/1
2003, 2-nd S.I.2003, 2-nd S.I.2004, No. 22004, S.I.2005, No. 5 2006, No. 4 2006,
No. 6/1