(3CehGL Ydi GdCKjQ (B: s (3OQGSI aj COj JjSjQ GdSHhd ZjQ GdefThQ (B/ s - (3GdNWHG, ahRjs ((3YeGf (B:s (3OGQ GdjfGHjY ddfTQ h GdJhRjY,s, 1997)
Keywords: (3GdCOH GdYQHjs; (3GdfbO GdCOHjs; (3GdCQOfs; (3GdCOHGA GdYQHs