@article{PA_2016_5_2_a1,
     author = {S. Yu. Graf},
     title = {On the {Schwarzian} norm of harmonic mappings},
     journal = {Problemy analiza},
     pages = {20--32},
     publisher = {mathdoc},
     volume = {5},
     number = {2},
     year = {2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PA_2016_5_2_a1/}
}