(3GdJaGVd h GdJcGed h GdgfOSI GdJMdjdjI (B/ s - (3YdGhfg, YOfGf YhVs; (3YRGe, eajOs ((3YeGf (B:s (3OGQ GdacQ ddfTQ h GdJhRjY,s, 1990)
(3EYJeO L(B2 (3aj GdhUa GdHjHdjhZQGajs
Keywords: (3GdMSGHs; (3GdJaGVd h GdJcGeds; (3GdgfOSI GdJMdjdjIs