@article{RSMUP_1979__61__325_0,
     author = {Zampieri, Giuseppe},
     title = {Sistemi del tipo $(Pu = f, \ Qu = g)$ non globalmente risolubili},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {325--329},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {61},
     year = {1979},
     mrnumber = {569670},
     zbl = {0437.35013},
     language = {it},
     url = {http://archive.numdam.org/item/RSMUP_1979__61__325_0/}
}