(3GdJYdjb Ydi bGfhf GdCMhGd GdTNUjI(B.s (3GdLRA GdChd,s (3GdRhGL hGdWdGb (B/s - (3GdNedjT, CMeOs ((3GdQHGW (B:s (3OGQ fTQ GdeYQaI,s, 1987)
(3cTGaGJ (B: (3UaMI (B443-459.s
(3HHdjhLQGajI (B: (3UaMI (B441-442.s
Keywords: (3GdCMhGd GdTNUjIs -- (3bhGfjf hJTQjYGJs -- (3GdeZQHs; (3GdRhGLs -- (3bhGfjf hJTQjYGJs -- (3GdeZQHs; (3GdRhGL (B((3abg ESdGej(B)s