@article{COCV_2002__7__379_0,
     author = {Alessandrini, Giovanni and Nesi, Vincenzo},
     title = {Univalent $\sigma $-harmonic mappings : applications to composites},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {379--406},
     publisher = {EDP-Sciences},
     volume = {7},
     year = {2002},
     doi = {10.1051/cocv:2002060},
     mrnumber = {1925034},
     zbl = {1024.30010},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/cocv:2002060/}
}