@article{UFA_2015_7_3_a4,
     author = {V. V. Davydovych},
     title = {Preliminary group classification of $(2+1)$-dimensional linear ultraparabolic {Kolmogorov--Fokker--Planck} equations},
     journal = {Ufa mathematical journal},
     pages = {38--46},
     publisher = {mathdoc},
     volume = {7},
     number = {3},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UFA_2015_7_3_a4/}
}