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3. [3] Axler, Sheldon; Bourdon, Paul; Ramey, Wade Harmonic function theory, Graduate Texts in Mathematics, 137, Springer, 2001
4. Weighted estimates for the Helmholtz equation and some applications;['Barceló, Juan A.', 'Ruiz, Alberto', 'Vega, Luis'];J. Funct. Anal.,1997
5. Uniform asymptotic solutions of a class of second-order linear differential equations having a turning point and a regular singularity, with an application to Legendre functions;['Boyd, William G. C.', 'Dunster, T. M.'];SIAM J. Math. Anal.,1986