@article{FPM_2012_17_5_a3,
     author = {T. E. Krenkel},
     title = {On the geometry of two qubits},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {69--73},
     year = {2012},
     volume = {17},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2012_17_5_a3/}
}