@article{DM_1998_10_2_a8,
     author = {V. A. Orlov},
     title = {On strongly essential systems of functions in $P_k$},
     journal = {Diskretnaya Matematika},
     pages = {120--127},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1998_10_2_a8/}
}