VALIUKEVIČIUS, G. Notion of the virtual derivative. Nonlinear Analysis: Modelling and Control, [S. l.], v. 16, n. 1, p. 116–122, 2011. DOI: 10.15388/NA.16.1.14119. Disponível em: https://www.journals.vu.lt/nonlinear-analysis/article/view/14119.. Acesso em: 18 jul. 2024.