Peter Winkler. Puzzled: Solutions and sources. Communications of the ACM, 56(12):126, 2013. [doi]
@article{Winkler13g, title = {Puzzled: Solutions and sources}, author = {Peter Winkler}, year = {2013}, doi = {10.1145/2534706.2534727}, url = {http://doi.acm.org/10.1145/2534706.2534727}, researchr = {https://researchr.org/publication/Winkler13g}, cites = {0}, citedby = {0}, journal = {Communications of the ACM}, volume = {56}, number = {12}, pages = {126}, }