Daniel K. Du, Qing-Hu Hou, Ronghua Wang,
"Infinite Orders and Non-D-finite Property of 3-Dimensional Lattice Walks"
, in The Electronic Journal of Combinatorics, 8-2016, ISSN: 1077-8926
Original Titel:
Infinite Orders and Non-D-finite Property of 3-Dimensional Lattice Walks