Gregory J. Fee, Michael B. Monagan. Problems, puzzles, challenges. ACM Comm. Computer Algebra, 31(4):48-49, 1997. [doi]
@article{FeeM97a,
title = {Problems, puzzles, challenges},
author = {Gregory J. Fee and Michael B. Monagan},
year = {1997},
doi = {10.1145/274888.274891},
url = {http://doi.acm.org/10.1145/274888.274891},
researchr = {https://researchr.org/publication/FeeM97a},
cites = {0},
citedby = {0},
journal = {ACM Comm. Computer Algebra},
volume = {31},
number = {4},
pages = {48-49},
}