Paul W. Franks, "Jewish Philosophy after Kant: the Legacy of Salomon Maimon" in Michael L. Morgan & Peter Eli Gordon (ed.), The Cambridge Companion to Modern Jewish Philosophy, Cambridge University Press (2007), p. 53
Gottfried Gabriel, "Frege, Lotze, and the Continental Roots of Early Analytic Philosophy," in: Erich H. Reck (ed.). From Frege to Wittgenstein: Perspectives on Early Analytic Philosophy, Oxford University Press, 2002, pp. 39–51, esp. 44–48.