@article{MS2_1985__56_166928,
     author = {Ernst S. Selmer},
     title = {On the postage stamp problem with three stamp denominations, {III.}},
     journal = {Mathematica Scandinavica},
     pages = {105--116},
     publisher = {mathdoc},
     volume = {56},
     year = {1985},
     zbl = {0569.10031},
     url = {http://geodesic.mathdoc.fr/item/MS2_1985__56_166928/}
}