title: Nonlinearities and complex behavior in simple ecological and epidemiological models.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000635:transmission; D000818:Animals; D003141:Communicable Diseases / Q000382:microbiology / Q000469:parasitology / Q000635:transmission*; D004463:Ecology; D004813:Epidemiology; D006790:Host-Parasite Interactions; D006801:Humans; D008433:Mathematics; D008954:Models, Biological; D012725:Sexual Behavior; D012749:Sexually Transmitted Diseases / Q000635:transmission