1. Classical Many-Body Problems Amenable to Exact Treatments;Calogero,2001
2. Partially superintegrable (indeed isochronous) systems are not rare;Calogero,2004
3. Isochronous dynamical systems;Calogero;Applicable Anal,2004
4. Calogero F (2004c) Isochronous systems. Proceedings of the VI International Conference on Geometry, Integrability and Quantization, Varna, June 2004. Edited by Mladenov IM and Hirshfeld AC, Sofia, Bulgaria, 2005, pp. 11–61 (ISBN 954-84952-9-5).
5. Periodic motions galore: how to modify nonlinear evolution equations so that they feature a lot of periodic solutions;Calogero;Nonlinear Math. Phys,2002