@article{CMJ_2010_60_4_a21,
     author = {Yang, Ke-Ben and Zhou, Ze-Hua},
     title = {Essential norm of the difference of composition operators on {Bloch} space},
     journal = {Czechoslovak Mathematical Journal},
     pages = {1139--1152},
     year = {2010},
     volume = {60},
     number = {4},
     mrnumber = {2738975},
     zbl = {1220.47045},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2010_60_4_a21/}
}