A.A. Agrachev, R.V. Gamkrelidze, Vector fields on n-bundles over 2n-dimensional manifolds

Title: Vector fields on n-bundles over 2n-dimensional manifolds
Authors: A.A. Agrachev, R.V. Gamkrelidze
Journal title: J. Math. Sci.
Year: 2006
Volume: 135
Pages: 3093–3108