. (1976). -. (e14721). Journal of Environmental Studies, 6(6), e14721
. "-" .e14721 , Journal of Environmental Studies, 6, 6, 1976, e14721.
. (1976). '-', Journal of Environmental Studies, 6(6), e14721.
, "-," Journal of Environmental Studies, 6 6 (1976): e14721,
. -. JES. 1976;6(6):e14721 (In Persian).
