, 2018a, Semiotics, epistemology, and mathematics, in N. Presmeg, L. Radford, W. Roth & G. Kadunz (eds.), Signs of signification, Dordrecht, Springer, pp. 155-171.
, 2018b, The philosophy of mathematical education between Platonism and the computer, in P. Ernest (ed.), The philosophy of mathematics education today, Dordrecht, Springer, pp. 61-79.
, 2011, Justus and Hermann Grassmann: philosophy and mathematics, in S. Russ & J. Liesen (eds.), From Past to Future: Graßmann's Work in Context, Dordrecht, Springer, pp. 61-70.
, 2005, Mathematics, sign and activity, in M. H. G. . Hoffmann, J. Lenhard & F. Seeger (eds.), Activity and sign, Dordrecht, Springer, pp. 9-22.
, 2003, 'Does mathematics have objects? in what sense?', Synthese 134 (1-2), 181-216.
, 1994a, Historiographical trends in the social history of mathematics and science, in K. Gavroglu, J. Christianidis & E. Nicolaidis (eds.), Trends in the historiography of science, Dordrecht, Springer, pp. 295-315.