@article{10_4153_CMB_1961_032_6,
     author = {Lambek, Joachim},
     title = {How to {Program} an {Infinite} {Abacus}},
     journal = {Canadian mathematical bulletin},
     pages = {295--302},
     year = {1961},
     volume = {4},
     number = {3},
     doi = {10.4153/CMB-1961-032-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1961-032-6/}
}