@article{MM2_1980__33_154747,
     author = {M.G. Garroni and M.A. Vivaldi},
     title = {Bilateral {Inequalities} and {Implicit} {Unilateral} {Systems} of the {Non-Variational} {Type.}},
     journal = {Manuscripta mathematica},
     pages = {177--216},
     publisher = {mathdoc},
     volume = {33},
     year = {1980},
     zbl = {0452.35043},
     url = {http://geodesic.mathdoc.fr/item/MM2_1980__33_154747/}
}