@article{IM2_2014_78_1_a1,
     author = {D. Greb and Ch. Lehn and S. Rollenske},
     title = {Lagrangian fibrations on hyperk\"ahler fourfolds},
     journal = {Izvestiya. Mathematics },
     pages = {22--33},
     publisher = {mathdoc},
     volume = {78},
     number = {1},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2014_78_1_a1/}
}