(3GdMeGjI h Gdfeh GdUfGYj aj GdYQGb (B: s (3OQGSI fXQjI (B/ s - (3GdbQjTj, eOMJ cGXes ((3HZOGO (B:s (3GdeDSSI GdYQHjI ddOQGSGJ hGdfTQ,s, 1982)
Keywords: (3GdYQGbs; (3GdCMhGd GdEbJUGOjIs