, 1997, Reflection in set theory the Bernays-levy axiom system, in E. Agazzi & G. Darvas (eds.), Philosophy of mathematics today, Dordrecht, Springer, pp. 137-169.
with Fraser, J.T. , Haber, F. C. (eds) , 1972a, The study of time: proceedings of the first conference of the international society for the study of time oberwolfach (black Forest) — West Losevy, Springer, Dordrecht.