@article{DM_2001_13_3_a6,
     author = {A. A. Makhnev and D. V. Paduchikh},
     title = {Extensions of $\mathit{GQ}(4,2)$, the completely regular case},
     journal = {Diskretnaya Matematika},
     pages = {91--109},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2001_13_3_a6/}
}