Martin Pollet, Volker Sorge, Manfred Kerber. Intuitive and Formal Representations: The Case of Matrices. In Andrea Asperti, Grzegorz Bancerek, Andrzej Trybulec, editors, Mathematical Knowledge Management, Third International Conference, MKM 2004, Bialowieza, Poland, September 19-21, 2004, Proceedings. Volume 3119 of Lecture Notes in Computer Science, pages 317-331, Springer, 2004. [doi]