@article{Akagi_2020,
title={Hard and easy instances of L-tromino tilings},
volume={815},
ISSN={0304-3975},
url={http://dx.doi.org/10.1016/j.tcs.2020.02.025},
DOI={10.1016/j.tcs.2020.02.025},
journal={Theoretical Computer Science},
publisher={Elsevier BV},
author={Akagi,
Javier T. and Gaona,
Carlos F. and Mendoza,
Fabricio and Saikia,
Manjil P. and Villagra,
Marcos},
year={2020},
month=may,
pages={197–212} }