1. Mixed feedback: a paradigm for regular and irregular oscillations;an der Heiden,1987
2. Singularly perturbed delay-differential equations;Chow,1983
3. Ordinary and Delay Differential Equations;Driver,1977
4. A mathematical analysis of the Grodins model of respiratory control;Fowler;IMA J. Math. Appl. Med. Biol.,1993
5. Onset of chaos in differential delay equations;Hale;J. Comput. Phys.,1988