@article{AFM_1990_15_1_a6,
     author = {Zhong Li},
     title = {The lower bound of the maximal dilatation of the {Beurling-Ahlfors} extension},
     journal = {Annales Fennici Mathematici},
     pages = {75--81},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {1990},
     doi = {10.5186/aasfm.1990.1522},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1990.1522/}
}