-
Structure and AbstractionIn Matthias Schirn (ed.), The Philosophy of Mathematics Today: Papers From a Conference Held in Munich From June 28 to July 4,1993, Clarendon Press. 1998.
-
Mathematik als Wissenschaft der GerstaltenIn Reinhard Fabian (ed.), Christian von Ehrenfels: Leben und Werk, Rodopi. 1986.
-
Evidence in FavourIn Michael J. Loux & Dean W. Zimmerman (eds.), The Oxford handbook of metaphysics, Oxford University Press. pp. 357. 2003.
Lugano, Ticino, Switzerland