@article{DM_1990_2_3_a14,
     author = {Zh. Dou},
     title = {Questions of completeness for finitely generated function systems $\langle P_{k,E_2}\widetilde\Omega\rangle$ and $\langle P_{k,E_2},\widehat\Omega\rangle$},
     journal = {Diskretnaya Matematika},
     pages = {128--136},
     publisher = {mathdoc},
     volume = {2},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1990_2_3_a14/}
}