(3UahI GdJaSjQ(B((3GdbSe GdKGfj(B) : s (3ShQJj(B((3Bd YeQGf hGdfSGA(B) / s ((3HjQhJ (B: s (3OGQ GdbQGf GdcQje , s, 1981)
Keywords: (3GdJaSjQ hYdhe GdbQGfs