@article{sussman_1986,
    author = {Hector J. Sussmann},
    title = {A product expansion of the Chen series},
    year = {1986},
    date-added = {2026-3-13 15:1:13 +0100}
}

@article{sussman_1986, author = {Hector J. Sussmann}, title = {A product expansion of the Chen series}, year = {1986}, date-added = {2026-3-13 15:1:13 +0100} }