OPRZĘDKIEWICZ, Krzysztof. The positivity of the fractional order model of a two-dimensional temperature field. Bulletin of the Polish Academy of Sciences Technical Sciences, [S. l.], v. 71, n. 4, p. e145675, 2023. DOI: 10.24425/bpasts.2023.145675. Disponível em: https://wydawnictwo.pan.pl/index.php/bpasts/article/view/3553. Acesso em: 31 aug. 2026.