(3GdeUWdM GdadSai YfO GdYQH (B: s (3fUhU ef GdJQGK JGadSai ai MOhO GdGTjGA hQShegG (B/ s - (3YHOGdGejQ GdGYSes ((3GdbGgQI (B: s (3GdgjFI GdeUQjI GdYGeI ddcJGH , s, 1989)
Keywords: (3GdadSaIs; (3GdadGSaIs; (3GdadGSaI GdYQHs; (3Yde GdcdGes