Admissible extremals in problems of variational calculus with constraints in the form of the system of linear inhomogeneous differential equations of first order with rectangular matrices. Neliniini Kolyvannya, [S. l.], v. 22, n. 4, p. 458–473, 2019. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/962. Acesso em: 6 dec. 2025.