@article{MT_1996_31_a3,
     author = {S. K. Vodopyanov and I. G. Markina},
     title = {Fundamentals of the nonlinear potential theory for subelliptic equations},
     journal = {Matemati\v{c}eskie trudy},
     pages = {100--160},
     publisher = {mathdoc},
     volume = {31},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1996_31_a3/}
}