• Journal for Research in Mathematics Education (1981) Vol. 12, No. 2

    I ISSN 0021-8251 JOURNAL FOR RESEARCH IN MATHEMATICS EDUCATION An Attentional Model for the Conceptual Construction of Units and Number Ernst von Glasersfeld The Addition Methods of f irst-and Second-Grade Children Dorothy M. Houlihan and Herbert P. Ginsburg Conservation of Equation and Function Under Transformations o