[1]
Gutik, O. and Savchuk, A. 2019. On the monoid of cofinite partial isometries of $\qq{N}^n$ with the usual metric. Proceedings of the International Geometry Center. 12, 3 (Dec. 2019), 51-68. DOI:https://doi.org/10.15673/tmgc.v12i3.1553.