Koukkoufis, Andreas, e Julian Williams. «SEMIOTIC OBJECTIFICATIONS OF THE COMPENSATION STRATEGY: EN ROUTE TO THE REIFICATION OF INTEGERS». Revista Latinoamericana de Investigación en Matemática Educativa, vol. 9, n.º 4, dezembro de 2006, pp. 157-75, https://www.relime.org/index.php/relime/article/view/481.