IVANOV, D. Increasing regularity of generalized solutions to the wave equation for computing optimal boundary controls. Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie), [S. l.], v. 17, n. 49, p. 299–308, 2016. DOI: 10.26089/NumMet.v17r328. Disponível em: https://en.num-meth.ru/index.php/journal/article/view/891. Acesso em: 29 apr. 2024.