θ-mappings and quasiconformal mappings in normed spaces
Rendiconti del Seminario Matematico della Università di Padova, Tome 57 (1977), pp. 173-182. 
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     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://archive.numdam.org/item/RSMUP_1977__57__173_0/}
}
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Porru, Giovanni. $\theta $-mappings and quasiconformal mappings in normed spaces. Rendiconti del Seminario Matematico della Università di Padova, Tome 57 (1977), pp. 173-182. http://archive.numdam.org/item/RSMUP_1977__57__173_0/

[1] P. Caraman, N-dimensional quasiconformal mappings, Ed. Ac. Bucuresti and Abacus Press Tumbridge Wells, Kent, England (1974). | Zbl

[2] W.F. Gehring, The Carathèodory convergence theorem for quasiconformal mappings in space, Ann. Acad. Sci. Fenn. Ser. AI 336/11 (1963). | MR | Zbl

[3] G. Porru, Quasiconformal mappings in normed spaces, In print by the Proceedings of the 3rd Romanian-Finnish Seminar on Complex Analysis (Bucharest, 28/6-2/7 1976). | Zbl