* [[Anna Sfard]] [1987]: Two Conceptions of Mathematical Notions: Operational and Structural. In: Proceedings of the 11th International Conference of PME, Vol. III, Montreal, S. 162-169.<br />
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* [[Anna Sfard|Sfard, A.]] (1987). Two Conceptions of Mathematical Notions: Operational and Structural. In: Proceedings of the 11th International Conference of PME, Vol. III, Montreal, S. 162-169
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* [[Malcolm Swan]] [1982]: The teaching of functions and graphs. In: Conference on functions, 1-5, S.151-165, Enschede.<br />
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* [[Malcolm Swan|Swan, M.]] (1982). The teaching of functions and graphs. In: Conference on functions, 1-5, S.151-165, Enschede
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