1. Achinstein, P.: 1968, Concepts of Science, Johns Hopkins Press, Baltimore.
2. Balzer, W.: 1978, ‘Incommensurability and Reduction’, in Niiniluoto and Tuomela ( 1978 ), pp. 313–335.
3. Balzer, W. and Sneed, J.: 1977, ‘Generalized Net Structures of Empirical Theories, I’, Studia Logica 36, 195–211.
4. Beth, E., ‘Semantics of Physical Theories’, in H. Freudenthal (ed.), The Concept and the Role of the Model in Mathematics and Natural and Social Sciences, Reidel, Dordrecht, 1961, pp. 48–51.
5. Bogdan, R.J. (ed.): 1976, Local Induction, Reidel, Dordrecht.