SKAKAUSKAS, Vladas; AMBRAZEVIČIUS, Algirdas. An immunity-structured SEIRS epidemic model with variable infectivity and spatial heterogeneity. Nonlinear Analysis: Modelling and Control, [S. l.], v. 28, n. 4, p. 735–759, 2023. DOI: 10.15388/namc.2023.28.32230. Disponível em: https://www.zurnalai.vu.lt/nonlinear-analysis/article/view/32230. Acesso em: 19 apr. 2025.