Yichuan Yang. A Lattice-Ordered Skew Field Is Totally Ordered If Squares Are Positive. The American Mathematical Monthly, 113(3):265-266, 2006. [doi]
@article{Yang06-14, title = {A Lattice-Ordered Skew Field Is Totally Ordered If Squares Are Positive}, author = {Yichuan Yang}, year = {2006}, url = {http://www.jstor.org/stable/27641895}, researchr = {https://researchr.org/publication/Yang06-14}, cites = {0}, citedby = {0}, journal = {The American Mathematical Monthly}, volume = {113}, number = {3}, pages = {265-266}, }