@article{CMFD_2009_34_a6,
     author = {M. A. Skryabin},
     title = {Partition of unity and the strong ellipticity problem for functional differential operators},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {139--151},
     publisher = {mathdoc},
     volume = {34},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2009_34_a6/}
}