LAUKAITIS, A.; RAČKAUSKAS, A. Functional Data Analysis of Payment Systems. Nonlinear Analysis: Modelling and Control, [S. l.], v. 7, n. 2, p. 53–68, 2002. Disponível em: https://www.zurnalai.vu.lt/nonlinear-analysis/article/view/15194. Acesso em: 25 may. 2025.