@article{RSMUP_1991__86__213_0,
     author = {Appell, J. and De Pascale, E. and Zabrejko, P. P.},
     title = {Multivalued superposition operators},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {213--231},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {86},
     year = {1991},
     mrnumber = {1154110},
     zbl = {0748.47049},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1991__86__213_0/}
}