@article{TRSPY_1991_196_a1,
     author = {M. M. Anzin},
     title = {On variations of positive quadratic forms (with applications to the study of perfect forms)},
     journal = {Informatics and Automation},
     pages = {11--26},
     publisher = {mathdoc},
     volume = {196},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1991_196_a1/}
}