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(2005)., Why is it morally wrong to clone a human being?: how to evaluate arguments of biopolitics, biomorality, and bioethics, in F. Thiele, R. Ashcroft & F. Wütscher (eds.), Bioethics in a small world, Dordrecht, Springer, pp. 121-128.

(1997). Bolzano's method of variation: three puzzles. Grazer Philosophische Studien 53, pp. 139-165.

(1990)., Judgement-contents, in K. Mulligan (ed.), Mind, meaning and metaphysics, Dordrecht-Boston-London, Kluwer, pp. 181-196.

(1985). Was existence ever a predicate?. Grazer Philosophische Studien 25, pp. 269-284.

with Seifert, J. , Wenisch, F. (eds) (1982). Vom Wahren und Guten: Festschrift für Balduin Schwarz zum 80. Geburtstag, St. Peter, Salzburg.

(1978). Brentano and his place in Austrian philosophy. Grazer Philosophische Studien 5, pp. 1-9.