Peter Winkler. Puzzled. Communications of the ACM, 54(5):120, 2011. [doi]
@article{Winkler11b,
title = {Puzzled},
author = {Peter Winkler},
year = {2011},
doi = {10.1145/1941487.1941514},
url = {http://doi.acm.org/10.1145/1941487.1941514},
researchr = {https://researchr.org/publication/Winkler11b},
cites = {0},
citedby = {0},
journal = {Communications of the ACM},
volume = {54},
number = {5},
pages = {120},
}