Preferably, use a perforating wheel to cut,
but in lack of such, you can cut along lines with a scalpel,
taking care to not cut all the way to the edge.
Exhibition catalogue published in conjunction with show held at the Museum Haus Lange, Krefeld, Germany, January 18 - March 1, 1981. Essay by Gerhard Storck. Includes exhibition history, biography and a brief bibliography. Texts in German.