. "de La Vega" . "Optimal control"@en . "Constanza de La Vega" . "Ekeland's principle" . "ef76a978d2cd138fdff11261f0bdba9b" . "Lipschitz continuity" . "Constanza" . . "Second-order optimality conditons"@en . "Pontryagin's principle" . "Integral equations"@en . "State constraints"@en . "State constraint" .