@article{Lambek_1961,
    doi = {10.4153/cmb-1961-032-6},
    url = {https://doi.org/10.4153%2Fcmb-1961-032-6},
    year = {1961},
    month = {sep},
    publisher = {Canadian Mathematical Society},
    volume = {4},
    number = {3},
    pages = {295--302},
    author = {Joachim Lambek},
    title = {How to Program an Infinite Abacus},
    journal = {Canadian Mathematical Bulletin}
}

@article{Lambek_1961, doi = {10.4153/cmb-1961-032-6}, url = {https://doi.org/10.4153%2Fcmb-1961-032-6}, year = {1961}, month = {sep}, publisher = {Canadian Mathematical Society}, volume = {4}, number = {3}, pages = {295--302}, author = {Joachim Lambek}, title = {How to Program an Infinite Abacus}, journal = {Canadian Mathematical Bulletin} }