Peter Winkler. Puzzled: Solutions and sources. Communications of the ACM, 57(9):102, 2014. [doi]
@article{Winkler14e, title = {Puzzled: Solutions and sources}, author = {Peter Winkler}, year = {2014}, doi = {10.1145/2642744}, url = {http://doi.acm.org/10.1145/2642744}, researchr = {https://researchr.org/publication/Winkler14e}, cites = {0}, citedby = {0}, journal = {Communications of the ACM}, volume = {57}, number = {9}, pages = {102}, }