A necessary and sufficient condition for the existence of positive solutions of fourth-order singular boundary value problems. - Zhaocai Hao; Lishan Liu; Lokenath Debnath (Appl. Math. Lett., 2003)

On eigenvalue intervals and eigenfunctions of fourth-order singular boundary value problems. - Zhaocai Hao; Lokenath Debnath (Appl. Math. Lett., 2005)

The Unique Solution for Sequential Fractional Differential Equations with Integral Multi-Point and Anti-Periodic Type Boundary Conditions. - Zhaocai Hao; Beibei Chen (Symmetry, 2022)