(3GdYQHjI (B: (3OQGSGJ ai GddZI hGddgLGJ hGdGSGdjH (B/ s - (3QeVGf YHOGdJhGHs; (3ac, jhgGfs ([S.N] : (3ecJHI GdNGfLi , s, 1980)
Keywords: (3JGQjNs; (3GdYdes; (3GdGhRGf GdTYQjIs; (3GddZI GdYQHjIs; (3GddgLGJs; (3abg GddZI GdYQHjIs; (3GdGSdhHs