A.A. Agrachev, R.V. Gamkrelidze, The Morse index and the Maslov index for smooth control systems

Title: The Morse index and the Maslov index for smooth control systems
Authors: A.A. Agrachev, R.V. Gamkrelidze
Journal title: Dokl. Acad. Nauk SSSR
Year: 1986
Volume: 287
Pages: 521-524
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