Andrew Rechnitzer. Haruspicy 2: The anisotropic generating function of self-avoiding polygons is not D-finite. Journal of Combinatorial Theory, Series A, 113(3):520-546, 2006. [doi]
@article{Rechnitzer06,
title = {Haruspicy 2: The anisotropic generating function of self-avoiding polygons is not D-finite},
author = {Andrew Rechnitzer},
year = {2006},
doi = {10.1016/j.jcta.2005.04.010},
url = {http://dx.doi.org/10.1016/j.jcta.2005.04.010},
researchr = {https://researchr.org/publication/Rechnitzer06},
cites = {0},
citedby = {0},
journal = {Journal of Combinatorial Theory, Series A},
volume = {113},
number = {3},
pages = {520-546},
}