Sebastian M. Cioaba. Problem 11066. The American Mathematical Monthly, 111(2):166, 2004. [doi]
@article{Cioaba04-0, title = {Problem 11066}, author = {Sebastian M. Cioaba}, year = {2004}, url = {http://www.jstor.org/stable/4145224}, researchr = {https://researchr.org/publication/Cioaba04-0}, cites = {0}, citedby = {0}, journal = {The American Mathematical Monthly}, volume = {111}, number = {2}, pages = {166}, }