(3WGYI GdGhGeQ hGKQgG aj GdeSDhdjI GdLRGFjI (B: s (3OQGSI ebGQfI (B/ s - (3SdeGf , MceJ ehSi s ((3HZOGO (B: s (3GdGeGfI GdYGeI ddKbGaI hGdTHGH , s, 1987)
Keywords: (3GdbGfhf GdNGU s