@article{JCA_2020_27_2_JCA_2020_27_2_a8,
     author = {N. Sagara},
     title = {Optimality {Conditions} for {Nonconvex} {Variational} {Problems} with {Integral} {Constraints} in {Banach} {Spaces}},
     journal = {Journal of convex analysis},
     pages = {565--581},
     year = {2020},
     volume = {27},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/JCA_2020_27_2_JCA_2020_27_2_a8/}
}