(3LgGR GdJhbjY GdQGOGQi GdGhJheGJi (B((3CQHG(B) / s - (3UdGM UGdMs ([S.N] : (3aDGO gGTe GdcJHi , s, 1989)
Keywords: (3GdJcfhdhLjGs; (3GdQGOGQ ai GdedGMIs; (3GdGLgRIs