@article{CMH_1972__47_139510,
     author = {Julian Lawrynowicz},
     title = {On the {Parametrization} of {Quasiconformal} {Mappings} with {Invariant} {Boundary} {Points} in an {Annulus}},
     journal = {Commentarii mathematici Helvetici},
     pages = {213--219},
     publisher = {mathdoc},
     volume = {47},
     year = {1972},
     zbl = {0252.30028},
     url = {http://geodesic.mathdoc.fr/item/CMH_1972__47_139510/}
}