Robert Ryman. - Adolphs, Volker; Epars, Ariane; Ketter, Olav; Raussmüller, Urs; Reise, Barbara; Sauer, Christel; Schreier, Christoph; Schwenk, Bernhart; Weis, Albert; Zoderer, Beat (Edition tertium Ostfildern,, 2000)