@article{RSMUP_1977__57__173_0,
     author = {Porru, Giovanni},
     title = {$\theta $-mappings and quasiconformal mappings in normed spaces},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {173--182},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {57},
     year = {1977},
     zbl = {0411.30007},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1977__57__173_0/}
}