@article{SMZ_2006__47_2_53193,
     author = {Pokrovskii, A.V.},
     title = {Function classes defined from local approximations by solutions to hypoelliptic equations.},
     journal = {Sibirskij Matematicheskij Zhurnal},
     pages = {394},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {2006},
     zbl = {1115.35033},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/SMZ_2006__47_2_53193/}
}