Problem length as a structural variable in verbal arithmetic problems Max Jerman OriginalPaper Pages: 109 - 123
The concept of grouping in Jean Piaget's psychology — Formalization and applications Erich Wittmann OriginalPaper Pages: 125 - 146
Charles Godfrey (1873–1924) and the reform of mathematical education A. G. Howson OriginalPaper Pages: 157 - 180
Sur l'assimilation des programmes de 6ème-5ème Une Équipe De L'I. R. E. M. De Strasbourg OriginalPaper Pages: 207 - 242
