@article{van_Kampen_1938,
    title = {On the reduction of dynamical systems by means of parametrized invariant relations},
    volume = {44},
    ISSN = {1088-6850},
    url = {http://dx.doi.org/10.1090/S0002-9947-1938-1501966-6},
    DOI = {10.1090/s0002-9947-1938-1501966-6},
    number = {2},
    journal = {Transactions of the American Mathematical Society},
    publisher = {American Mathematical Society (AMS)},
    author = {van Kampen, E. R. and Wintner, Aurel},
    year = {1938},
    pages = {168–195},
    date-added = {2023-11-19 23:14:49 +0100}
}

@article{van_Kampen_1938, title = {On the reduction of dynamical systems by means of parametrized invariant relations}, volume = {44}, ISSN = {1088-6850}, url = {http://dx.doi.org/10.1090/S0002-9947-1938-1501966-6}, DOI = {10.1090/s0002-9947-1938-1501966-6}, number = {2}, journal = {Transactions of the American Mathematical Society}, publisher = {American Mathematical Society (AMS)}, author = {van Kampen, E. R. and Wintner, Aurel}, year = {1938}, pages = {168–195}, date-added = {2023-11-19 23:14:49 +0100} }