@article{BUMI_2013_9_6_2_a8,
     author = {Sorrentino, Alfonso},
     title = {A {Variational} {Approach} to the {Study} of the {Existence} of {Invariant} {Lagrangian} {Graphs}},
     journal = {Bollettino della Unione matematica italiana},
     pages = {405--440},
     publisher = {mathdoc},
     volume = {Ser. 9, 6},
     number = {2},
     year = {2013},
     zbl = {1305.37032},
     mrnumber = {3112987},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_2013_9_6_2_a8/}
}