(3JGQjNfG (B/ s ((3WQGHdS (B( (3djHjG (B) :s (3OGQ GdJQGK,s, 1977)
(3eL(B6 (3YHGQI Yf agGQS ddcJGHs
Keywords: (3djHjGs; (3GdJGQjNs