
Heckel later summarized in this way his woodcut developments, mainly developed during his years in Die Brücke
Source: Brücke' Zeichnungen, Aquarelle, Druckgraphik, Magdalena M. Moeller; Verlag Gerd Hatje, Stuttgart 1992, p. 21; as quoted by Louise Albiez https://www.researchgate.net/publication/272168564Claire (incl. translation), Brücke und Berlin: 100 Jahre Expressionismus; submitted to the Division of Humanities New College of Florida, Sarasota, Florida, May, 2013 p.12