Main group 1

• Simmons, George Finlay; Krantz, Steven G., Differential equations: theory, technique and practice, Boston, McGraw-Hill, 2007

Main group 2

• Hirsch, Morris W.; Smale, Stephen; Devaney, Robert L., Differential equations, dynamical systems, and an introduction to chaos, 2nd rev. ed., Amsterdam, Elsevier/Academic Press, Press, c 2004