Lefschetz, S. (1977). Differential equations: Geometric theory .-2nded. (2d ed.). Dover Publications.
Chicago ZitierstilLefschetz, Solomon. Differential Equations: Geometric Theory .-2nded. 2d ed. New York: Dover Publications, 1977.
MLA ZitierstilLefschetz, Solomon. Differential Equations: Geometric Theory .-2nded. 2d ed. Dover Publications, 1977.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.