Pei Yu Wenjing Zhang 0005 Complex Dynamics in a Unified SIR and HIV Disease Model: A Bifurcation Theory Approach. 2447-2500 2019 29 J. Nonlinear Sci. 5 https://doi.org/10.1007/s00332-019-09550-7 https://www.wikidata.org/entity/Q127954116 db/journals/jns/jns29.html#YuZ19