(3LgGdGJ YUQ GdJfhjQ bQGAI ai acQ bGSe Gejf hYdi YHOGdQGRb (B/ s - (3eMeO LdGd cTcs ((3GdbGgQI (B: s (3ecJHI GdJQGK GdGSdGei , s, 1990)
Keywords: (3GdJGQjNs; (3GdeDQNhfs; (3bGSe Gejfs; (3Ydi YHOGdQGRbs