@article{JCA_1998_5_1_a4,
     author = {A. J. B. Lopes-Pinto},
     title = {On a {New} {Result} on the {Existence} of {Zeros} {Due} to {Ricceri}},
     journal = {Journal of convex analysis},
     pages = {057--062},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {1998},
     url = {http://geodesic.mathdoc.fr/item/JCA_1998_5_1_a4/}
}