@misc{RCM_2010_44_1_a2,
     title = {A {Variational} {Characterization} of the {Fucik} {Spectrum} and {Applications}},
     journal = {Revista colombiana de matematicas},
     pages = {23--40},
     publisher = {mathdoc},
     volume = {44},
     number = {1},
     year = {2010},
     url = {http://geodesic.mathdoc.fr/item/RCM_2010_44_1_a2/}
}