@article{CMJ_2008_58_4_a15,
     author = {Tripathi, Amitabha},
     title = {The postage stamp problem and arithmetic in base $r$},
     journal = {Czechoslovak Mathematical Journal},
     pages = {1097--1100},
     year = {2008},
     volume = {58},
     number = {4},
     mrnumber = {2471168},
     zbl = {1174.11013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2008_58_4_a15/}
}