, 2014, On the "sum of all differences" and the origin of mathematics according to Leibniz: mathematical and philosophical aspects, in D. Riesenfeld & G. Scarafile (eds.), Perspectives on theory of controversies and the ethics of communication, Dordrecht, Springer, pp. 69-80.
, 2008a, Symbolic inventiveness and "irrationalist" practices in Leibniz's mathematics, in M. Dascal (ed.), Leibniz, Dordrecht, Springer, pp. 125-139.