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Husen, T. (ed.):International Study of Achievement in Mathematics: A Comparison of Twelve Countries, Vols. I and II. Stockholm: Almqvist and Wiksell, New York: John Wiley 1967.
Foshay, A. W. (ed.):Educational Achievement of Thirteen-Year-Olds in Twelve Countries. Hamburg: Unesco Institute for Education 1962.
Wolf, R.:Data Bank Manual. Hamburg: Unesco Institute for Education 1967. Copies of this manual may be secured by writing to: Coordinator, I.E.A. Project Institute for Education, 2000 Hamburg 13, Feldbrunnenstr. 70, Federal Republic of Germany.
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Wolf, R. Use of the computer in educational research: The international educational achievement project (I.E.A.). Int Rev Educ 14, 232–238 (1968). https://doi.org/10.1007/BF01419940
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DOI: https://doi.org/10.1007/BF01419940