ROMAN, Svetlana. Linear differential equation with additional conditions and formulae for green’s function. Mathematical Modelling and Analysis, [S. l.], v. 16, n. 3, p. 401–417, 2011. DOI: 10.3846/13926292.2011.602125. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/5543. Acesso em: 9 may. 2025.