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From the didactical triangle to the socio-didactical tetrahedron: artifacts as fundamental constituents of the did... http://t.co/fYGwUnkt
From the didactical triangle to the socio-didactical tetrahedron: artifacts as fundamental constituents of the did... http://t.co/fYGwUnkt
From the didactical triangle to the socio-didactical tetrahedron: artifacts as fundamental constituents of the d... http://t.co/VAdj0Bje