Michael Brand. No easy puzzles: Hardness results for jigsaw puzzles. Theoretical Computer Science, 586:2-11, 2015. [doi]
@article{Brand15-0,
title = {No easy puzzles: Hardness results for jigsaw puzzles},
author = {Michael Brand},
year = {2015},
doi = {10.1016/j.tcs.2015.02.030},
url = {http://dx.doi.org/10.1016/j.tcs.2015.02.030},
researchr = {https://researchr.org/publication/Brand15-0},
cites = {0},
citedby = {0},
journal = {Theoretical Computer Science},
volume = {586},
pages = {2-11},
}