John McCarthy, Lee Badger, Marc Williams. The Tower of Stanford: 10956. The American Mathematical Monthly, 111(4):364-365, 2004. [doi]
@article{McCarthyBW04,
title = {The Tower of Stanford: 10956},
author = {John McCarthy and Lee Badger and Marc Williams},
year = {2004},
url = {http://www.jstor.org/stable/4145258},
researchr = {https://researchr.org/publication/McCarthyBW04},
cites = {0},
citedby = {0},
journal = {The American Mathematical Monthly},
volume = {111},
number = {4},
pages = {364-365},
}