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(2015). Is Euler's circle a symbol or an icon?. Sign systems studies 43 (4), pp. 597-615.

with Schang, F. (2015)., On rules and refereeing in football, in A. Koslow & A. Buchsbaum (eds.), The road to universal logic II, Basel, Birkhäuser, pp. 407-415.

with Giardino, V. , Mols, S. , Van Bendegem, J. P. (2012). Introduction: from practice to results in mathematics and logic. Philosophia Scientiae 16 (1), pp. 5-11.

with Giardino, V. , Mols, S. , Van Bendegem, J. P. (eds) (2012). From practice to results in logic and mathematics. Philosophia Scientiae 16 (1).

with Abeles, F. F. (2011). Hugh MacColl and Lewis Carroll: crosscurrents in geometry and logic. Philosophia Scientiae 15 (1), pp. 55-76.

with Read, S. (2011). Preface. Philosophia Scientiae 15 (1), pp. 1-5.

with Read, S. (eds) (2011). Hugh MacColl after one hundred years. Philosophia Scientiae 15 (1).