(3GdfGQ bHd GdEfaLGQ (B/ s - (3gGeHShf, fhQeGfs; (3bQehW, PhbGfs ((3HjQhJ (B:s (3OGQ GdeSjQI,s, 1988)
Keywords: (3aQfSGs; (3GdJGQjN GdSjGSjs; (3GdKhQGJs