@article{Wilf_1978,
    doi = {10.2307/2320864},
    url = {https://doi.org/10.2307%2F2320864},
    year = {1978},
    month = {aug},
    publisher = {{JSTOR}},
    volume = {85},
    number = {7},
    pages = {562},
    author = {Herbert S. Wilf},
    title = {A Circle-Of-Lights Algorithm for the "Money-Changing Problem"},
    journal = {The American Mathematical Monthly}
}

@article{Wilf_1978, doi = {10.2307/2320864}, url = {https://doi.org/10.2307%2F2320864}, year = {1978}, month = {aug}, publisher = {{JSTOR}}, volume = {85}, number = {7}, pages = {562}, author = {Herbert S. Wilf}, title = {A Circle-Of-Lights Algorithm for the "Money-Changing Problem"}, journal = {The American Mathematical Monthly} }