1. Bennet, C., & Sjögren, J. (2013). Philosophy and mathematics education. In F. Radovic & S. Radovic (Eds.), Modus Tolland: En festskrift med anledning av Anders Tollands sextioårsdag. Gothenburg: Philosophical Communications. Web Series 59. Available at http://www.flov.gu.se/digitalAssets/1452/1452479_modustolland.-en-festskrift.pdf .
2. Bradley, D. (2011). Justified concepts and the limits of the conceptual approach to the a priori. Croatian Journal of Philosophy, XI(33), 267–274.
3. Carnap, R. (1945). The two concepts of probability. Philosophy and Phenomenological Research, 5(4), 513–32.
4. Carnap, R. (1950). Logical foundations of probability. Chicago: University of Chicago Press.
5. Forrai, G. (2011). Grounding concepts: The problem of composition. Philosophia, 39, 721–731.