Fitzpatrick, P., Furi, M., Zecca, P., Furi, M., & Zecca, P. (1993). Topological methods for ordinary differential equations: Lectures given at the 1st session of the Centro internazionale matematico estivo (C.I.M.E.), held in Montecatini Terme, Italy, June 24-July 2, 1991. Berlin ; New York: Springer-Verlag.

Fitzpatrick, Patrick,, M. Furi, P. Zecca, M. Furi, and P. Zecca. Topological Methods for Ordinary Differential Equations: Lectures Given At the 1st Session of the Centro Internazionale Matematico Estivo (C.I.M.E.), Held in Montecatini Terme, Italy, June 24-July 2, 1991. Berlin ; New York: Springer-Verlag, 1993.

Fitzpatrick, Patrick,, et al. Topological Methods for Ordinary Differential Equations: Lectures Given At the 1st Session of the Centro Internazionale Matematico Estivo (C.I.M.E.), Held in Montecatini Terme, Italy, June 24-July 2, 1991. Berlin ; New York: Springer-Verlag, 1993.