(3gGedJ(B: (3OQGSI ai GdJMdjd GdfaSi (B/ s - (3f(B.(3f(B. (3OQGchdjOSs ((3HjQhJ (B: s (3GdeDSSI GdMOjKI ddcJGH , s, 1987)
Keywords: (3GdJMdjd GdfaSis