@article{CMH_1987__62_140080,
     author = {D.H. Hamilton and J.L. Fern\'andez},
     title = {Length of curves under conformal mappings.},
     journal = {Commentarii mathematici Helvetici},
     pages = {122--134},
     publisher = {mathdoc},
     volume = {62},
     year = {1987},
     zbl = {0611.30011},
     url = {http://geodesic.mathdoc.fr/item/CMH_1987__62_140080/}
}