Antonio Granata, Asymptotic Behaviors of Wronskians and Finite Asymptotic Expansionsin the Real Domain - Part II: Mixed Scales and Exceptional Cases, Volume 12, International Journal of Advanced Research in Mathematics (Volume 12)
https://www.scipress.com/IJARM.12.35
Abstract:
    In this second Part of our work we study the asymptotic behaviors of Wronskians involving both regularly- and rapidly-varying functions, Wronskians of slowly-varying functions and other special cases. The results are then applied to the theory of asymptotic expansions in the real domain.
Keywords:
    Asymptotic Behaviors of Wronskians, Asymptotic Expansions in the Real Domain, Chebyshev Asymptotic Scales, Rapidly-Varying Functions of Higher Order, Smoothly(Regularly)-Varying Functions of Higher Order