@article{Kang_Cheng_2006, title={Positive periodic solutions of superlinear systems of integral equations depending on parameters}, volume={27}, url={https://apcz.umk.pl/TMNA/article/view/TMNA.2006.015}, abstractNote={A class of superlinear system of integral equations depending on multi
parameters is considered. It is shown that there are three mutually
exclusive and exhaustive subsets $\Theta _{1},\Gamma $ and $\Theta _{2}$ of
the parameter space such that there exist at least two positive periodic
solutions associated with elements in $\Theta _{1}$, at least one positive
periodic solution associated with $\Gamma $ and none associated with $\Theta
_{2}$.}, number={2}, journal={Topological Methods in Nonlinear Analysis}, author={Kang, Shugui and Cheng, Sui Sun}, year={2006}, month={Jun.}, pages={387–398} }