Stanley Huang. Problem 11398. The American Mathematical Monthly, 115(10):948, 2008. [doi]
@article{Huang08-15, title = {Problem 11398}, author = {Stanley Huang}, year = {2008}, url = {http://www.jstor.org/stable/27642644}, researchr = {https://researchr.org/publication/Huang08-15}, cites = {0}, citedby = {0}, journal = {The American Mathematical Monthly}, volume = {115}, number = {10}, pages = {948}, }