@article{MAN_1968__176_161678,
     author = {H. RENGGLI},
     title = {Slight {Modifications} of {Riemann} {Surfaces} and {Quasiconformal} {Mappings.}},
     journal = {Mathematische Annalen},
     pages = {39--44},
     publisher = {mathdoc},
     volume = {176},
     year = {1968},
     zbl = {0189.09202},
     url = {http://geodesic.mathdoc.fr/item/MAN_1968__176_161678/}
}