%0 Journal Article %T Green¡¯s Function and Positive Solutions of a Third-Order Equation with Periodic Boundary Conditions %A Kosmatov %A Nickolai %J - %D 2020 %R https://doi.org/10.1155/2020/7917434 %X We apply the fixed point index to obtain positive solutions of a nonresonant periodic boundary value problem for a third-order differential equation %U https://www.hindawi.com/journals/ddns/2020/7917434/