@article{JLT_2013_23_3_JLT_2013_23_3_a11,
     author = {X. Feng and P. Niu },
     title = {Interior {Regularity} for {Degenerate} {Elliptic} {Equations} with {Drift} on {Homogeneous} {Groups}},
     journal = {Journal of Lie theory},
     pages = {803--825},
     publisher = {mathdoc},
     volume = {23},
     number = {3},
     year = {2013},
     url = {http://geodesic.mathdoc.fr/item/JLT_2013_23_3_JLT_2013_23_3_a11/}
}