@article{CMH_1989__64_1_140176,
     author = {S.L. Krushkal},
     title = {Grunsky coefficient inequalities, {Caratheodory} metric and extremal quasiconformal mappings.},
     journal = {Commentarii mathematici Helvetici},
     pages = {650--660},
     year = {1989},
     volume = {64},
     number = {1},
     zbl = {0697.30016},
     url = {http://geodesic.mathdoc.fr/item/CMH_1989__64_1_140176/}
}