1. Neurath, Hahn, Carnap 1973: 308.
2. Suppe 1977a and 1977b; see also Suppe 1989, p. I, ‘From the received view to the semantic conception’ (pp. 1–77).
3. See, for example, Carnap 1963a: 51; see also Neurath 1935: 8.
4. See Kraft 1961: 817f.
5. Duhem 1962b: 328.