On general dissections of a polygon.
On general dissections of a polygon. (Short Communication).
On multi-avoidance of right angled numbered polyomino patterns.
On the generation and enumeration of some classes of convex polyominoes.
On the permanents of certain circulant matrices and related Toeplitz matrices. (Über die Permanente gewisser zirkulanter Matrizen und damit zusammenhängender Toeplitz-Matrizen.)
On the sequence A079500 and its combinatorial interpretations.
On Translating One Polyomino To Tile the Plane.