A New Formula for the Volume of Lattice Polyhedra. Krzysztof Kolodziejczyk — 1996 Monatshefte für Mathematik
On starshapedness of the union of closed sets in R n Krzysztof Kołodziejczyk — 1987 Colloquium Mathematicae
On a Hadwiger-Wills inequality concerning lattice points. Kołodziejczyk, Krzysztof — 1999 Beiträge zur Algebra und Geometrie