(3JWhjQ GdJOQjS ai GdadSaI hGdOQGSGJ GdGLJeGYjI (B/ s - (3eMehO GHhRjO GHQGgjes ((3GdbGgQI(B: s (3eQcR GdcJGH ddfTQ , s, 1991)
Keywords: (3GdJYdjes; (3GdJNWjWs; (3GdJOQjSs; (3GdOQGSGJ GdGLJeGYjIs; (3efGgLs; (3GdWQb GdadSajIs