%0 Journal Article %A Mohammadpouri, A., Kafili, L., Hosseinoghli, R. %T L_1 operator and Gauss map of quadric surfaces %J Journal of New Researches in Mathematics %V 5 %N 4 %P 81-90 %D 2019 %R %U https://sanad.iau.ir/fa/Article/797835