@article{yang_pao_1999, title={Positive solutions and dynamics of some reaction diffusion models in HIV transmission}, volume={35}, ISSN={["0362-546X"]}, DOI={10.1016/S0362-546X(97)00672-X}, number={3}, journal={NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS}, author={Yang, ZP and Pao, CV}, year={1999}, month={Feb}, pages={323–341} }