(3GdeYQaI GdYdejI cfTGWs - (3TajQjas; (3WGQb eYUQGfj (B((3JQLeI(B)s ((3QhSjGs (3OGQ GdJbOe(B- (3ehSchs, 1989)
Keywords: Natural Sciences (3GdYdhe GdHMJIs; General