@article{IM2_2013_77_4_a6,
     author = {V. L. Popov},
     title = {Tori in the {Cremona} groups},
     journal = {Izvestiya. Mathematics },
     pages = {742--771},
     publisher = {mathdoc},
     volume = {77},
     number = {4},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2013_77_4_a6/}
}