Yang , Qian and Ni , Mingkang. (2022). Asymptotics of a Class of Singularly Perturbed Weak Nonlinear Boundary Value Problem with a Multiple Root of the Degenerate Equation.
            <i>Journal of Nonlinear Modeling and Analysis</i>. <i>4</i> (3).
            502-513.
         doi:10.12150/jnma.2022.502