@article{RSMUP_1974__51__221_0,
     author = {Favini, Angelo},
     title = {Su certe equazioni astratte ultraparaboliche},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {221--256},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {51},
     year = {1974},
     mrnumber = {420335},
     zbl = {0305.35053},
     language = {it},
     url = {http://www.numdam.org/item/RSMUP_1974__51__221_0/}
}