(3VQGFH GdONd (B: s (3Hjf GdJTQjY GdVQjHj h GdJWhjQ h GdJWHjb GdeMGSHj (B/s - (3Gejf GdSjO GMeO dWaj(B,s ((3GdbGgQI (B: s (3ecJHI TGOj(B, s, 1991)
.674-649 (3HHdjhLQGajG(B: (3UaMGJ(B.s
(3GdfU HGddZI GdYQHjIs
Keywords: (3VQGFH GdONds; (3GdVQGFHs; (3EbJUGOs; (3VQGFH GdUfGYGJs; (3VQGFH GdCQHGMs; (3GdVQGFH GdYbGQjIs