A class of reversible cubic systems with an isochronous center
The authors study cubic differential systems having an isochronous center and an inverse integrating factor formed by two different parallel straight lines. They have found nine subclasses of such time-reversible systems. The authors also prove that time-reversible polynomial differential systems with a nondegenerate center have half of the isochronous constant equal to zero and present two open problems.
scientific article; zbMATH DE number 1437666