@article{ASNSP_2009_5_8_4_647_0,
     author = {Barja, Miguel \'Angel and Stoppino, Lidia},
     title = {Slopes of trigonal fibred surfaces and of higher dimensional fibrations},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {647--658},
     publisher = {Scuola Normale Superiore, Pisa},
     volume = {Ser. 5, 8},
     number = {4},
     year = {2009},
     mrnumber = {2647907},
     zbl = {1204.14017},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_2009_5_8_4_647_0/}
}