Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_2005_77_6_a9, author = {S. P. Khekalo}, title = {Stepwise {Gauge} {Equivalence} of {Differential} {Operators}}, journal = {Matemati\v{c}eskie zametki}, pages = {917--929}, publisher = {mathdoc}, volume = {77}, number = {6}, year = {2005}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_2005_77_6_a9/} }
S. P. Khekalo. Stepwise Gauge Equivalence of Differential Operators. Matematičeskie zametki, Tome 77 (2005) no. 6, pp. 917-929. http://geodesic.mathdoc.fr/item/MZM_2005_77_6_a9/