(3RHOI GddHf (B: s (3ahGFO dZhjI h MOjKjI h WHjI (B/ s - (3GdSjhWj, LdGd GdOjfs; (3EHQGgje, eQRhb Ydjs ((3GdbGgQI (B:s (3OGQ GdCYJUGe,s, 1989)
Keywords: (3GddZI GdYQHjIs; (3GdETJbGbs; (3GdWH GdTYHjs