@article{IVM_1970_7_a9,
     author = {S. L. Pevzner},
     title = {Invariants of a~pair of real quadratic forms},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {83--91},
     publisher = {mathdoc},
     number = {7},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1970_7_a9/}
}