(3cJGH JGQjN GUHgGf (B((3PcQCNHGQ CUHgGf(B) / s - (3GHhfYje GdGUHgGfi , CMeOs; (3SjO cSQhi MSf (B((3JMbjb(B)s ((3HjQhJ (B: s (3OGQ GdcJH GdYdejI , s, 1990)
Keywords: (3JGQjNs; (3GjQGfs; (3GdJQGLes; (3GdaQSs; (3GUHgGfs