Cui , YaqiongKang , Shugui and Chen , Huiqin. (2023). Iterative Positive Solutions to Nonlinear $q$-Fractional Differential Equations with Integral Boundary Value Conditions.
            <i>Journal of Nonlinear Modeling and Analysis</i>. <i>5</i> (3).
            446-455.
         doi:10.12150/jnma.2023.446