References
Karl-Norbert Ihmig
(2005). Newton's program of mathematizing nature. In M. H. G. . Hoffmann, J. Lenhard, & F. Seeger (Eds.). Activity and sign (pp. 241-261). Dordrecht: Springer.
(2002). The symbol in the theory of science: Duhem's alleged instrumentalism or conventionalism and the continuity of scientific development. In M. Ferrari, & I. Stamatescu (Eds.). Symbol and physical knowledge (pp. 75-96). Dordrecht: Springer.