@article{CMH_1982__57_139910,
     author = {Albert II Baernstein and J.E. Brown},
     title = {Integral means of derivatives of monotone slit mappings.},
     journal = {Commentarii mathematici Helvetici},
     pages = {331--348},
     publisher = {mathdoc},
     volume = {57},
     year = {1982},
     zbl = {0504.30013},
     url = {http://geodesic.mathdoc.fr/item/CMH_1982__57_139910/}
}