found: Vitruvs Proportionsfigur, c1987:t.p. (Frank Zöllner)
found: Michelangelo, [2014]:t.p. (Frank Zöllner) inside back cover (editor and author, Frank Zöllner, doctoral thesis on motifs originating from Antiquity in the history of art and architecture of the Medieval and Renaissance periods, 1987; published numerous works on art and art theory; since 1996 Professor of Medieval and Modern Art at University of Leipzig)
found: Wikipedia web site, viewed 27 April 2015(Frank Zöllner, born 26 June 1956 in Bremen, German art historian and professor)
