(3QMdI Edi GdjGHGf (B: s (3eTGgOGJ aj CQV hGYjg (B- (3CSjQaj aj HdGO GdJfjf GdCUaQ (B/ s - (3SYjO, eMeOs ((3GdbGgQg (B:s (3ecJHI GHf SjfG,s, 1991)
Keywords: (3GdjGHGfs; (3GdSaQs