@article{10_4064_ap82_1_6,
     author = {Marek Galewski},
     title = {New variational principle and duality for an
 abstract semilinear {Dirichlet} problem},
     journal = {Annales Polonici Mathematici},
     pages = {51--60},
     publisher = {mathdoc},
     volume = {82},
     number = {1},
     year = {2003},
     doi = {10.4064/ap82-1-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap82-1-6/}
}