ARONSSON, Gunnar. Pontryagin’s Maximum Principle and a Minimax Problem. Mathematica Scandinavica, Berkeley, CA, United States, v. 29, p. 55–71, 1971. DOI: 10.7146/math.scand.a-11034. Disponível em: https://journals.msp.org/mscand/article/view/2317. Acesso em: 25 jul. 2026.