Vasile Mihai. Problem 11049. The American Mathematical Monthly, 110(10):956, 2003. [doi]
@article{Mihai03, title = {Problem 11049}, author = {Vasile Mihai}, year = {2003}, url = {http://www.jstor.org/stable/3647972}, researchr = {https://researchr.org/publication/Mihai03}, cites = {0}, citedby = {0}, journal = {The American Mathematical Monthly}, volume = {110}, number = {10}, pages = {956}, }