@article{RSMUP_1990__84__109_0,
     author = {Patrone, Fioravante},
     title = {Well-posed minimum problems for preorders},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {109--121},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {84},
     year = {1990},
     mrnumber = {1101286},
     zbl = {0724.49004},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1990__84__109_0/}
}