, 1987, 'Science and ethics, some of the main principles and problems', Grazer Philosophische Studien 30, 11-23.
, 1990a, Wittgenstein — ethics and the "wonderful life", in R. Haller & J. L. Brandl (eds.), Wittgenstein — eine neubewertung/Wittgenstein — towards a re-evaluation, Dordrecht, Springer, pp. 273-279.