%0 Journal Article %A Tran, Dien Hien %T The dispersion of gas exhalations and the problem of distribution of new sources on a dry hilly surface %J Applications of Mathematics %D 1986 %P 257-269 %V 31 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/AM.1986.104205/ %R 10.21136/AM.1986.104205 %G en %F 10_21136_AM_1986_104205