@article{JEMS_2017_19_6_a2,
     author = {Pablo Guarino and Welington de Melo},
     title = {Rigidity of smooth critical circle maps},
     journal = {Journal of the European Mathematical Society},
     pages = {1729--1783},
     publisher = {mathdoc},
     volume = {19},
     number = {6},
     year = {2017},
     doi = {10.4171/jems/704},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/704/}
}