(3QMdg EHf HWhWg (B: s (3JMag GdfXGQ aj ZQGFH GdGeUGQ h YLGFH GdCSaGQ (B/ s - (3GdYQjGf, eMeO YHO GdefYes ((3HjQhJ (B:s (3OGQ GMjGA GdYdhe,s, 1987)
Keywords: (3GdQMdGJs; (3SaQs