Mahmudov, E. N., and G. C¸i¸cek. “Optimization of Differential Inclusions of Bolza Type With State Constraints and Duality”. CUBO, A Mathematical Journal, vol. 7, no. 2, Aug. 2005, pp. 21-38, https://cubo.ufro.cl/index.php/cubo/article/view/1540.