1. Abraham, R. and Marsden, J. E. (1967).Foundations of Mechanics, Benjamin, Reading, Massachusetts (1972).
2. Flaschel, P. and Klingenberg, W. (1972).Riemannsche Hilbertmannigfaltigkeiten, Periodische Geodätische, Springer, Lecture Notes in Mathematics 282.
3. Greub, W., Halperin, S. and Vanstone, R. (1973).Connections, Curvature and Cohomology II, Academic Press, New York/London.
4. Gawedzki, K. and Szapiro, T. (1974).Reports on Mathematical Physics,6, 477.
5. Hermann, R. (1973).Topics in the Mathematics of Quantum Mechanics (Interdisciplinary Mathematics VI), privately printed, U.S.A.