Duhem, P.M.M. (1906a) La théorie physique. Son objet et sa structure, Paris: Chevalier et Rivière; 2nd edn, 1914; repr. Paris: Vrin, 1989; German trans. F. Adler, intro. by E. Mach Ziel und Struktur der physikalischen Theorien, Leipzig: J.A. Barth, 1908; trans. P.P. Wiener, The Aim and Structure of Physical Theory, Princeton, NJ: Princeton University Press, 1954. (Originally published in the Revue de philosophie 4, 1904; 5, 1904; and 6, 1905. Duhem’s major essay on the philosophy of science.)