@Article{CMR-32-272,
author = {Lü , YueSun , PengCai , Hua and Han , Peishan},
title = {Existence of Multiple Positive Periodic Solutions for Second Order Differential Equations},
journal = {Communications in Mathematical Research },
year = {2021},
volume = {32},
number = {3},
pages = {272--280},
abstract = {<p style="text-align: justify;">In this paper, we study the existence of multiple positive periodic solutions
for the second order differential equation $$x&#39;&#39;(t) + p(t)x&#39; (t) + q(t)x(t) = f(t, x(t)).$$ By using Krasnoselskii fixed point theorem, we establish some criteria for the existence and multiple positive periodic solutions for this differential equation.</p>},
issn = {2707-8523},
doi = {https://doi.org/10.13447/j.1674-5647.2016.03.09},
url = {http://global-sci.org/intro/article_detail/cmr/18899.html}
}