@article{IM2_1982_19_1_a5,
     author = {A. S. Rapinchuk},
     title = {Class numbers in the genus of quadratic forms, and algebraic groups},
     journal = {Izvestiya. Mathematics },
     pages = {79--93},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {1982},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1982_19_1_a5/}
}