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with Presmeg, N. , Roth, W. , Kadunz, G. , 2018a, Discussion and conclusions, in N. Presmeg, L. Radford, W. Roth & G. Kadunz (eds.), Signs of signification, Dordrecht, Springer, pp. 353-372.

with Presmeg, N. , Roth, W. , Kadunz, G. , 2018b, Introduction, in N. Presmeg, L. Radford, W. Roth & G. Kadunz (eds.), Signs of signification, Dordrecht, Springer, pp. 1-15.

, 2018a, A plea for a critical transformative philosophy of mathematics education, in P. Ernest (ed.), The philosophy of mathematics education today, Dordrecht, Springer, pp. 1-10.

, 2018b, Semiosis and subjectification: the classroom constitution of mathematical subjects, in N. Presmeg, L. Radford, W. Roth & G. Kadunz (eds.), Signs of signification, Dordrecht, Springer, pp. 21-35.

with Presmeg, N. , Roth, W. , Kadunz, G. (eds) , 2018, Signs of signification: semiotics in mathematics education research, Springer, Dordrecht.

, 2005a, The semiotics of the schema, in M. H. G. . Hoffmann, J. Lenhard & F. Seeger (eds.), Activity and sign, Dordrecht, Springer, pp. 137-152.