Mark Pinsky. Problem 11032. The American Mathematical Monthly, 110(7):637, 2003. [doi]
@article{Pinsky03, title = {Problem 11032}, author = {Mark Pinsky}, year = {2003}, url = {http://www.jstor.org/stable/3647756}, researchr = {https://researchr.org/publication/Pinsky03}, cites = {0}, citedby = {0}, journal = {The American Mathematical Monthly}, volume = {110}, number = {7}, pages = {637}, }