Peter Winkler. Puzzled. Communications of the ACM, 53(9):110, 2010. [doi]
@article{Winkler10e, title = {Puzzled}, author = {Peter Winkler}, year = {2010}, doi = {10.1145/1810891.1810917}, url = {http://doi.acm.org/10.1145/1810891.1810917}, researchr = {https://researchr.org/publication/Winkler10e}, cites = {0}, citedby = {0}, journal = {Communications of the ACM}, volume = {53}, number = {9}, pages = {110}, }