Victor Pambuccian. Problem 11122. The American Mathematical Monthly, 111(10):916, 2004. [doi]
@article{Pambuccian04-0, title = {Problem 11122}, author = {Victor Pambuccian}, year = {2004}, url = {http://www.jstor.org/stable/4145107}, researchr = {https://researchr.org/publication/Pambuccian04-0}, cites = {0}, citedby = {0}, journal = {The American Mathematical Monthly}, volume = {111}, number = {10}, pages = {916}, }