@article{JOLT_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},
     year = {2013},
     volume = {23},
     number = {3},
     doi = {10.5802/jolt.751},
     zbl = {1279.22029},
     url = {https://jolt.centre-mersenne.org/articles/10.5802/jolt.751/}
}