VILKAS, Robertas. Definition of an increasing function. Lietuvos matematikos rinkinys, [S. l.], v. 64, n. B, p. 98–113, 2023. DOI: 10.15388/LMD.2023.33600. Disponível em: https://www.journals.vu.lt/LMR/article/view/33600.. Acesso em: 19 may. 2024.