(3GdaQb ai GdejRGf (B: s (3HMhK eegOI dOQGSI GdaQb h GKQgG ai GdeLJYGJ (B/ s - (3QSdGf (B: (3eMehO eMeOs ((3GdbGgQI (B: s (3ecJHI GdeWjYi ddWHY hGdfTQ (B: s, 1990)
(3jTJed Ydi GQLGYGJ HHdjhLQGajIs
Keywords: (3GdaQb GdGSdGejIs; (3Gdabg GdGSdGeis -- (3ePGgHs