@article{ZNSL_1974_47_a10,
     author = {D. Yu. Grigor'ev},
     title = {On the algebraic complexity of a~pair of bilinear forms},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {159--163},
     publisher = {mathdoc},
     volume = {47},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1974_47_a10/}
}