The construction of approximate solution of optimal control problem for singular perturbation differential-algebraic system. Neliniini Kolyvannya, [S. l.], v. 17, n. 1, p. 127–136, 2014. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/733. Acesso em: 21 jan. 2026.