


On children's quantitative concept of rational number: construct and estimate the sum
In: Proceedings of the fifth annual meeting: Montréal Sept. 29 - Oct. 1, 1983 = actes de la cinquième rencontre annuelle / PME-NA, North American Chapter of the International Group for the Psychology of Mathematics Education, Jg. vol. 2, S. 272-2791983








Problem-orientated geometry teaching : with consideration of computers
In: Geometry teaching: Geometrieunterricht ; Conference on the Teaching of Geometry in Helsinki, 1. - 4.8.1989, Jg. 74, S. 141-1501989






Measurement of the internal spin structure of the proton
In: AIP Conference Proceedings, Jg. 95, S. 255-2581983
