DIX, Otto, Felix NUSSBAUM & Barthel GILLES. -- LÖFFLER, Fritz. Otto Dix 1891-1961, Recklinghausen: Aurel Bongers, [1981], 4°, illustrations, some coloured, cloth, dust-jacket. With Peter Junk and Wendelin Zimmer's Felix Nussbaum. Leben und Werk (Cologne, 1982) and Adam C. Oellers and Michael Euler-Schmidt's Barthel Gilles 1891-1977. Leben und Werk (Recklinghausen, 1987). (3)