The author J. Breukelaar has written about the period that Louis Wolf and Jenni Wolf-Schwarz spent in hiding, in the book Halte Varsseveld (n.p. 2005).
Addition
The author J. Breukelaar has written about the period that Louis Wolf and Jenni Wolf-Schwarz spent in hiding, in the book Halte Varsseveld (n.p. 2005).