(3HQfGeL JfejI QhM GdLeGYI hGdJYGhf Hjf GdJdGejP aj GdeOQS s - (3GdUGdM , efi SdjeGf(B, s; (3GdUGdM , efi SdjeGfs ((3hRGQI GdJQHjI (B- (3eQcR GdHMhK GdJQHhjI (B- (3GdchjJs, 1991)
2