Perko, L. (2001). Differential equations and dynamical systems (Third edition.). Springer.
Cita Chicago (17th ed.)Perko, Lawrence. Differential Equations and Dynamical Systems. Third edition. New York, USA: Springer, 2001.
Cita MLA (9th ed.)Perko, Lawrence. Differential Equations and Dynamical Systems. Third edition. Springer, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.