@article{ZNSL_1973_33_a2,
     author = {S. S. Ryshkov},
     title = {On the heory of reduction of positive quadratic forms},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {37--64},
     publisher = {mathdoc},
     volume = {33},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1973_33_a2/}
}