Robert A. Sulanke. Problem 10894. The American Mathematical Monthly, 108(8):770, 2001. [doi]
@article{Sulanke01,
title = {Problem 10894},
author = {Robert A. Sulanke},
year = {2001},
url = {http://www.jstor.org/stable/2695626},
researchr = {https://researchr.org/publication/Sulanke01},
cites = {0},
citedby = {0},
journal = {The American Mathematical Monthly},
volume = {108},
number = {8},
pages = {770},
}