Thierry Coquand, Peter Schuster. Unique paths as formal points. J. Logic & Analysis, 3, 2011. [doi]
@article{CoquandS11-0, title = {Unique paths as formal points}, author = {Thierry Coquand and Peter Schuster}, year = {2011}, url = {http://logicandanalysis.org/index.php/jla/article/view/107/39}, researchr = {https://researchr.org/publication/CoquandS11-0}, cites = {0}, citedby = {0}, journal = {J. Logic & Analysis}, volume = {3}, }