@article{MS2_1983__53_166860,
     author = {Ernst S. Selmer and Arne R\"odne},
     title = {On the postage stamp problem with three stamp denominations, {II.}},
     journal = {Mathematica Scandinavica},
     pages = {145--156},
     year = {1983},
     volume = {53},
     zbl = {0528.10039},
     url = {http://geodesic.mathdoc.fr/item/MS2_1983__53_166860/}
}