(3GdeMQQGJ GdEOGQjI (B:s (3MeGjJgG hGdcTa Yf JRhjQgG (B/s - (3GdMdGaj, SdjeGf NGdOs; (3UHMj, eMeO YR GdOjf s (1987)
(3HHdjhLQGajI (B: (3hQbI (B220-224.s
(3jTJed Ydi eSJNdU HGddZJjf GdYQHjI hGdEfLdjRjI(B.s
Keywords: (3GdJRhjQs -- (3bhGfjf hJTQjYGJs -- (3GdSYhOjIs; (3GdhKGFb GdEOGQjIs -- (3GdSYhOjIs; (3QSGdI LGeYjI (B((3eGLSJjQ(B)s