@article{RM_2017_72_2_a5,
     author = {A. A. Pakharev and M. B. Skopenkov},
     title = {Surfaces containing two circles through each point and decomposition of quaternionic matrices},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {381--383},
     publisher = {mathdoc},
     volume = {72},
     number = {2},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2017_72_2_a5/}
}