1. Albeverio, S., and Hoegh-Krohn, R. (1974).J. Math. Phys.,15(10), 1745.
2. Albeverio, S., Blanchard, Ph, and Høegh-Krohn, R. (1984). ?Diffusions sur une variété riemanienne: barrières infranchissables et applications,? Coll. en l'honneur de Laurent Schwartz, Asterisque S. Math. France.
3. Arnold, V. (1976).Methodes mathématiques de la mécanique classique. Ed. de Moscou.
4. Berry, M. V. (1981).Semiclassical Mechanics of Regular and Irregular Motion, Notes for 1981 Les Mouches Summer School. R. Helleman, ed. North-Holland, Amsterdam.
5. Caratheodory, C. (1965?1967).Calculus of Variations and Partial Differential Equations of the First Order. Holden-Day (1982). San Francisco.