SKLYAR, G.; FARDIGOLA, L. The Markov trigonometric moment problem in controllability problems for the wave equation on a half-axis. Математическая физика, анализ, геометрия, Харків, Україна, v. 9, n. 2, p. 233–242, 2002. Disponível em: http://mag.ilt.kharkiv.ua/index.php/mag/article/view/m09-0233e. Acesso em: 27 лип. 2024.