(3ef JGQjN GdeZJQHjf GdYQH aj GdYGde (B/ s - (3MOg, MQH MSf, s ((3OeTb (B[(3ShQjG(B]: s (3GdYQHj ddGYdGf hGdfTQ (B972.s, 1972)
(3jJVef cTGaGJ hedGMb(B.s
Keywords: (3GdeZJQHhf GdYQHs -- (3JGQjN(B.s; (3GdHdGO GdYQHjIs -- (3fRhM hgLQI(B.s; (3GdGbdjGJ GdYQHs -- (3gLQI(B.s