%0 Journal Article %A W. Huyer %T Semigroup formulation and approximation of a linear age-dependent population problem with spatial diffusion. %J Semigroup forum %D 1994 %P 99-114 %V 49 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SF_1994__49_2_135338/ %F SF_1994__49_2_135338