Mathias Beck, Nasha Komanda. A Congruence Involving Ceilings: 10918. The American Mathematical Monthly, 110(8):746-747, 2003. [doi]
@article{BeckK03, title = {A Congruence Involving Ceilings: 10918}, author = {Mathias Beck and Nasha Komanda}, year = {2003}, url = {http://www.jstor.org/stable/3647870}, researchr = {https://researchr.org/publication/BeckK03}, cites = {0}, citedby = {0}, journal = {The American Mathematical Monthly}, volume = {110}, number = {8}, pages = {746-747}, }