Caligaris, Marta Graciela, María Elena Schivo, and María Rosa Romiti. 2019. “Communication Competence in Mathematics: Analysis of the Evolution of Calculus Student Skills Throughout Their Freshmen Year”. International Journal of Learning, Teaching and Educational Research 18 (4):49-62. http://www.ijlter.myres.net/index.php/ijlter/article/view/573.