Voir la notice de l'article provenant de la source Math-Net.Ru
@article{TRSPY_1992_201_a12, author = {P. I. Lizorkin and V. S. Guliev}, title = {Functional spaces and approximation problems on {Heisenberg} group}, journal = {Informatics and Automation}, pages = {245--272}, publisher = {mathdoc}, volume = {201}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1992_201_a12/} }
P. I. Lizorkin; V. S. Guliev. Functional spaces and approximation problems on Heisenberg group. Informatics and Automation, Investigations in the theory of differentiable functions of many variables and its applications. Part 15, Tome 201 (1992), pp. 245-272. http://geodesic.mathdoc.fr/item/TRSPY_1992_201_a12/