(3eMGVQGJ aj GdJhLjg h GdEQTGO (B/ s - (3SeGQI, YRjRs; (3feQ, YUGes ((3YeGf (B:s (3OGQ GdacQ ddfTQ hGdJhRjY,s, 1991)
Keywords: (3GdEQTGO GdfaSjs; (3GdEQTGO GdJQHhjs; (3GdJhLjg GdJQHhjs