@article{MO_2020_94_2_a6, author = {E. G. Smoljanova}, title = {Vector-geometric interpretation of an invariant of a fractional-quadratic function}, journal = {Matemati\v{c}eskoe obrazovanie}, pages = {48--54}, publisher = {mathdoc}, volume = {94}, number = {2}, year = {2020}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MO_2020_94_2_a6/} }