(3JGQjN GdeYJbOGJ h GdCacGQ GdOjfjI (B/ s - (3CdjGO, ejQSjGs; (3YHGS, YHO GdgGOjs ((3OeTb (B:s (3OGQ OeTb ddfTQ,s, 1987)
Keywords: (3GdOjGfGJs; (3GdJGQjNs