(3GdMGSI GdSGOSI (B: (3OQGSI aj GdXhGgQ GdNGQbI (B/ s - (3YeQGf, WGdHs ((3OeTb (B: s (3OGQ GdeYQaI, s, 1990)
Keywords: (3Yde GdfaS(B. s; (3GdXhGgQ GdNGQbI(B. s; (3GdMGSI GdSGOSI(B. s