Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_2007_81_4_a17, author = {E. A. Shiryaev and A. A. Shkalikov}, title = {Regular and {Completely} {Regular} {Differential} {Operators}}, journal = {Matemati\v{c}eskie zametki}, pages = {636--640}, publisher = {mathdoc}, volume = {81}, number = {4}, year = {2007}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_2007_81_4_a17/} }
E. A. Shiryaev; A. A. Shkalikov. Regular and Completely Regular Differential Operators. Matematičeskie zametki, Tome 81 (2007) no. 4, pp. 636-640. http://geodesic.mathdoc.fr/item/MZM_2007_81_4_a17/