NORVIDAS, Saulius. A note about the deterministic property of characteristic functions. Nonlinear Analysis: Modelling and Control, [S. l.], v. 24, n. 1, p. 150–158, 2018. DOI: 10.15388/NA.2019.1.9. Disponível em: https://www.zurnalai.vu.lt/nonlinear-analysis/article/view/12925. Acesso em: 4 may. 2025.