GEBHARDT, M.; ZEHNER, F.; HESSELS, M. G. P. Basic Arithmetical Skills of Students with Learning Disabilities in the Secondary Special Schools: An Exploratory Study covering Fifth to Ninth Grade. Frontline Learning Research, [S. l.], v. 2, n. 1, p. 50–63, 2014. DOI: 10.14786/flr.v2i1.73. Disponível em: https://flr.journals.publicknowledgeproject.org/index.php/journal/article/view/73. Acesso em: 27 feb. 2025.