@article{AFM_1976_2_1_a31,
     author = {Olli Lehto and Olli Tammi},
     title = {Area method and univalent functions with quasiconformal extensions},
     journal = {Annales Fennici Mathematici},
     pages = {307--313},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {1976},
     doi = {10.5186/aasfm.1976.0220},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1976.0220/}
}