Jörg Schellmann, ed., Wall Works, Munich/New York, 1999, pp. 23-27 (other examples illustrated)
Jörg Schellmann, ed., Forty Are Better Than One, Munich/New York, 2009, pp. 12-13 (other examples illustrated) and p. 400
Udo Kittelmann and Gabriele Knapstein, ed., Wall Works, Berlin, 2014, p. 141 (another example illustrated)