(3GddGFMI GdJfajPjI dbGfhf GdVQGFH Ydi GdONd Qbe (B157 (3dSfI (B1981 :s (3GdUGOQI HbQGQ hRjQ GdeGdjI Qbe (B164 (3dSfI (B1982(3hGdbQGQGJ GdhRGQjI GdUGOQI JfajPkG dgPG GdbGfhf hGdfeGPL GdVQjHjI GdeJYdbI Hg (B/s - (3eUQ(B.s ((3GdbGgQI (B:s (3GdgjFI GdYGeI dTFhf GdeWGHY GdCejQjI,s, 1989)
Keywords: (3JTQjYGJ hbhGfjfs; (3GdeGdjI GdYGeI(B.s