@article{RSMUP_1975__54__201_0,
     author = {Ferro, Ruggero},
     title = {Limits to some interpolation theorems},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {201--213},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {54},
     year = {1975},
     mrnumber = {444448},
     zbl = {0354.02019},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1975__54__201_0/}
}