PLASKURA, Paweł. DERIVWWW - WEB-BASED SYMBOLIC DIFFERENTIATION SYSTEM. Information Technologies and Learning Tools, [S. l.], v. 60, n. 4, p. 254–263, 2017. DOI: 10.33407/itlt.v60i4.1578. Disponível em: https://journal.iitta.gov.ua/index.php/itlt/article/view/1578.. Acesso em: 7 may. 2024.