An 18-colouring of 3-space omitting distance one. - David Coulson (Discret. Math., 1997)

Computing Arithmetic Invariants of 3-Manifolds. - David Coulson; Oliver Goodman; Craig Hodgson; Walter D. Neumann (Exp. Math., 2000)

A 15-colouring of 3-space omitting distance one. - David Coulson (Discret. Math., 2002)