Erwin Just, Norman Schaumberger. Problem 11010. The American Mathematical Monthly, 110(4):341, 2003. [doi]
@article{JustS03,
title = {Problem 11010},
author = {Erwin Just and Norman Schaumberger},
year = {2003},
url = {http://www.jstor.org/stable/3647890},
researchr = {https://researchr.org/publication/JustS03},
cites = {0},
citedby = {0},
journal = {The American Mathematical Monthly},
volume = {110},
number = {4},
pages = {341},
}