(3GdQHG (B: s (3h CKQg Ydi GdeLJeY GdEfSGfj (B/ s - (3GdCTbQ, YeQ SdjeGfs ((3GdchjJ (B:s (3ecJHI GdadGM ddfTQ hGdJhRjY, s (3OGQ GdfaGFS ddfTQ hGdJhRjY, s, 1990)
Keywords: (3GdESdGe(B. s; (3Gdabg(B. s; (3GdeYGedGJ (B((3abg ESdGej(B). s; (3GdQHG(B. s