1. E.J. Balder, An extension of duality-stability relations to nonconvex optimization problems, SIAM J. Control Optimization 15 (1977), 329–343.
2. —, Lower semicontinuity of integral functionals with nonconvex integrands by relaxation-compactification, ibid. 19 (1981), 533–542.
3. —, Lower closure problems with weak convergence conditions in a new perspective, ibid. 20 (1982), No. 2, to appear.
4. —, On existence problems for the optimal control of certain nonlinear integral equations of Urysohn type, J. Optimization Theory Appl., to appear.
5. —, The complete Hamiltonian characterization of property (Q) and its application to infinite dimensional lower closure problems, submitted.