@article{IM2_1980_14_1_a5,
     author = {V. V. Nikulin},
     title = {Integral symmetric bilinear forms and some of their applications},
     journal = {Izvestiya. Mathematics},
     pages = {103--167},
     year = {1980},
     volume = {14},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1980_14_1_a5/}
}