2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/146181The coincidence site lattice (CSL) problem and its generalization to Z-modules in Euclidean 3-space is revisited, and various results and conjectures are proved in a unified way, by using maximal orders in quaternion algebras of class number 1 over real algebraic number fields.25 pagesMetric GeometryCombinatorics52C07, 52C23,11H06,11M41text