(3CTgQ GdeMGceGJ aj GdJGQjN (B: s (3ef hGbY SLdGJ GdeMGce (B/ s - (3GdYjSGhj, Ydj YHOGdYGds ((3HjQhJ (B: s (3OGQ GdLjd, s, 1991)
Keywords: (3GdbGfhf GdLfGFj(B. s; (3GdeMGceGJ(B. s; (3GdELQGAGJ GdeOfjI(B. s