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Altamimi, Moody E. and Abdou S. Youssef. “A More Canonical Form of Content MathML to Facilitate Math Search.” In Proceedings of Extreme Markup Languages 2007®.
Asperti, Andrea, Luca Padovani, Claudio Sacerdoti Coen and Irene Schena. “XML, Stylesheets and the Re-mathematization of Formal Content.” In Proceedings of Extreme Markup Languages 2001.