@article{SF_1994__49_2_135338,
     author = {W. Huyer},
     title = {Semigroup formulation and approximation of a linear age-dependent population problem with spatial diffusion.},
     journal = {Semigroup forum},
     pages = {99--114},
     publisher = {mathdoc},
     volume = {49},
     number = {2},
     year = {1994},
     zbl = {0827.92021},
     url = {http://geodesic.mathdoc.fr/item/SF_1994__49_2_135338/}
}