@article{AFM_1991_16_2_a1,
     author = {Xiangyang Liu and David Minda},
     title = {Monotonicity of hyperbolic curvature under univalent mappings},
     journal = {Annales Fennici Mathematici},
     pages = {227--242},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {1991},
     doi = {10.5186/aasfm.1991.1616},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1991.1616/}
}