(3Yde GdCLfI aj VhA GdbQBf hGdSfI (B:s (3ef CHMGK GdeDJeQ GdYGdej GdChd ddEYLGR GdYdej aj GdbQBf hGdSfI aj GdaJQI ef (B25-28 (3UaQ SfI (B1408 (3g`(B. / (3GdehGab (B18-21 (3CcJhHQ SfI (B1987 (3e (B/s - (3QGHWI GdYGde GdESdGej (B((3ecI GdecQeI(B)s ((3UfYGA (B:s (3LGeYI GdEjeGf,s, 1987)
Keywords: (3GdbQBfs -- (3EYLGRs; (3GdWH aj GdbQBfs; (3Yde GdCLfI GdHTQjI aj GdbQBfs