(3gh Gdqdg (B/ s - (3GdMSfj, eMeO Hf Ydhj GdeGdcjs ([(3ZjQ eYQha(B] : s [(3ZjQ eYQha(B](3, s, 1900)
Keywords: (3GdYbjOI GdOjfjI(B.s; (3Gddg(B.s; (3GdGdgjGJ(B.s