@article{JCA_1994_1_1_a1,
     author = {G. Alberti and P. Majer},
     title = {Gap {Phenomenon} for {Some} {Autonomous} {Functionals}},
     journal = {Journal of convex analysis},
     pages = {031--046},
     year = {1994},
     volume = {1},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/JCA_1994_1_1_a1/}
}