David Savitt. Problem 10994. The American Mathematical Monthly, 110(2):155-156, 2003. [doi]
@article{Savitt03, title = {Problem 10994}, author = {David Savitt}, year = {2003}, url = {http://www.jstor.org/stable/3647781}, researchr = {https://researchr.org/publication/Savitt03}, cites = {0}, citedby = {0}, journal = {The American Mathematical Monthly}, volume = {110}, number = {2}, pages = {155-156}, }