Ira M. Gessel, Louis H. Kalikow. Hypergraphs and a functional equation of Bouwkamp and de Bruijn. Journal of Combinatorial Theory, Series A, 110(2):275-289, 2005. [doi]
@article{GesselK05,
title = {Hypergraphs and a functional equation of Bouwkamp and de Bruijn},
author = {Ira M. Gessel and Louis H. Kalikow},
year = {2005},
doi = {10.1016/j.jcta.2004.11.002},
url = {http://dx.doi.org/10.1016/j.jcta.2004.11.002},
researchr = {https://researchr.org/publication/GesselK05},
cites = {0},
citedby = {0},
journal = {Journal of Combinatorial Theory, Series A},
volume = {110},
number = {2},
pages = {275-289},
}