@article{MZ_1983__183_173339,
     author = {Aimo Hinkkanen},
     title = {Rectangles and {Quasiconformal} {Mappings.}},
     journal = {Mathematische Zeitschrift},
     pages = {539--546},
     publisher = {mathdoc},
     volume = {183},
     year = {1983},
     zbl = {0518.30023},
     url = {http://geodesic.mathdoc.fr/item/MZ_1983__183_173339/}
}