@article{Agrachev_1981,
    title = {Chronological algebras and nonstationary vector fields},
    volume = {17},
    issn = {1573-8795},
    url = {http://dx.doi.org/10.1007/BF01084595},
    doi = {10.1007/bf01084595},
    number = {1},
    journal = {Journal of Soviet Mathematics},
    publisher = {Springer Science and Business Media LLC},
    author = {Agrachev, A. A. and Gamkrelidze, R. V.},
    year = {1981},
    pages = {1650–1675},
    date-added = {2025-5-5 15:19:16 +0100}
}

@article{Agrachev_1981, title = {Chronological algebras and nonstationary vector fields}, volume = {17}, issn = {1573-8795}, url = {http://dx.doi.org/10.1007/BF01084595}, doi = {10.1007/bf01084595}, number = {1}, journal = {Journal of Soviet Mathematics}, publisher = {Springer Science and Business Media LLC}, author = {Agrachev, A. A. and Gamkrelidze, R. V.}, year = {1981}, pages = {1650–1675}, date-added = {2025-5-5 15:19:16 +0100} }