@article{SM_2001_192_1_a3,
     author = {P. E. Markov},
     title = {Type number and rigidity of fibred surfaces},
     journal = {Sbornik. Mathematics},
     pages = {65--87},
     publisher = {mathdoc},
     volume = {192},
     number = {1},
     year = {2001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2001_192_1_a3/}
}