@article{AFM_2000_25_1_a6,
     author = {V.Ya. Gutlyanskii and O. Martio and V.I. Ryazanov and M. Vuorinen},
     title = {Infinitesimal geometry of quasiregular mappings},
     journal = {Annales Fennici Mathematici},
     pages = {101--130},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {2000},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AFM_2000_25_1_a6/}
}