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- Perko, Lawrence
Perko, Lawrence (Nombre personal)
His Differential equations and dynamical systems, c1991: t.p. (Lawrence Perko)
Differential equations and dynamical systems, ©2001: title page (Lawrence Perko) verso title page (Lawrence Perko Department of mathematics Northern Arizona University Flagstaff, AZ 86011 USA, Lawrence.Perko@nau. edu)