Igor Pak. Tile invariants: new horizons. Theoretical Computer Science, 2-3(303):303-331, 2003. [doi]
@article{Pak03, title = {Tile invariants: new horizons}, author = {Igor Pak}, year = {2003}, doi = {10.1016/S0304-3975(02)00495-4}, url = {http://dx.doi.org/10.1016/S0304-3975(02)00495-4}, researchr = {https://researchr.org/publication/Pak03}, cites = {0}, citedby = {0}, journal = {Theoretical Computer Science}, volume = {2-3}, number = {303}, pages = {303-331}, }