(3GdYGedhf ai GdNGQL (B((3OQGSI SjGSjI(B) / s - (3YeGO LGOs ([S.N] : (3YGde GdcJH GdMOjK , s, 1989)
Keywords: (3GdgLQIs; (3GdYed hGdYeGds; (3GdLhGfH GdGbJUGOjIs; (3GdYeGd GdeUQjhfs; (3GdgLQI GdNGQLjIs; (3GdYeGd GdegGLQhfs; (3GdfTGW GdSjGSis