ROCKAFELLAR, R. Tyrell. Semigroups of convex bifunctions generated by Lagrange problems in the calculus of variations. Mathematica Scandinavica, Berkeley, CA, United States, v. 36, p. 137–158, 1975. DOI: 10.7146/math.scand.a-11568. Disponível em: https://journals.msp.org/mscand/article/view/2046. Acesso em: 25 jul. 2026.