1. On the asymptotic solutions of a class of ordinary differential equations of the fourth order, with special reference to an equation of hydrodynamics;Langer, Rudolph E.;Trans. Amer. Math. Soc.,1957
2. On small disturbances of plane Couette flow;Wasow, Wolfgang;J. Research Nat. Bur. Standards,1953
3. C. C. Lin, On uniformly valid asymptotic solutions of the Orr-Sommerfeld equation, IX[ill] Congrès International de Mécanique Appliquée, Actes, vol. 1, 1957, pp. 136-148.
4. The solutions of the differential equation 𝑣”’+𝜆²𝑧𝑣’+3𝜇𝜆²𝑣=0;Langer, Rudolph E.;Duke Math. J.,1955