Daniel H. Ullman, Daniel J. Velleman, Douglas B. West. Problems and Solutions. The American Mathematical Monthly, 127(4):372-380, 2020. [doi]
@article{UllmanVW20c, title = {Problems and Solutions}, author = {Daniel H. Ullman and Daniel J. Velleman and Douglas B. West}, year = {2020}, doi = {10.1080/00029890.2020.1721194}, url = {https://doi.org/10.1080/00029890.2020.1721194}, researchr = {https://researchr.org/publication/UllmanVW20c}, cites = {0}, citedby = {0}, journal = {The American Mathematical Monthly}, volume = {127}, number = {4}, pages = {372-380}, }