@article{EMJ_2013_4_3_a3,
     author = {H. G. Ghazaryan},
     title = {Addition of lower order terms preserving almost hypoellipticity of polynomials},
     journal = {Eurasian mathematical journal},
     pages = {32--52},
     publisher = {mathdoc},
     volume = {4},
     number = {3},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EMJ_2013_4_3_a3/}
}