(Mrs. Thill offers the now accepted catalogue raisonné between 1963 and 1993, without Gerhard Richter's early works before 1962 after 1993, in German):Gerhard Richter: "The Condition of History.
Thill offers the now accepted "catalogue raisonné" between 1963 and 1993.:Gerhard Richter: "The Condition of History" in: Charles Harrison, & Paul Wood (Eds.