• [1] M. Abramowitz and I. A. Stegun, Handbook of mathematical functions with formulas, graphs, and mathematical tables, National Bureau of Standards, Applied Mathematics Series 55, 3rd printing, with corrections, March, 1965. MR 0167642 (29:4914)
• [2] P. F. Hsieh and Y. Sibuya, On the asymptotic integration of second order linear ordinary differential equations with polynomial coefficients, J. Math. Anal. Appl. 16 (1966), 84-103. MR 0200512 (34:403)
• [3] M. A. Neumark, Lineare Differential-Operatoren, Akademie-Verlag, Berlin, 1960. MR 0216049 (35:6884)
• [4] H. L. Turrittin, Solvable related equations pertaining to turning point problems, Proc. Sympos. Asymptotic Solutions of Differential Equations and Their Applications, pp. 27-52, Wiley, New York, 1964. MR 0192150 (33:377)

Bibliography

[1]

M. Abramowitz and I. A. Stegun, Handbook of mathematical functions with formulas, graphs, and mathematical tables, National Bureau of Standards, Applied Mathematics Series 55, 3rd printing, with corrections, March, 1965. MR 0167642 (29:4914)

[2]

P. F. Hsieh and Y. Sibuya, On the asymptotic integration of second order linear ordinary differential equations with polynomial coefficients, J. Math. Anal. Appl. 16 (1966), 84-103. MR 0200512 (34:403)

[3]

M. A. Neumark, Lineare Differential-Operatoren, Akademie-Verlag, Berlin, 1960. MR 0216049 (35:6884)

[4]

H. L. Turrittin, Solvable related equations pertaining to turning point problems, Proc. Sympos. Asymptotic Solutions of Differential Equations and Their Applications, pp. 27-52, Wiley, New York, 1964. MR 0192150 (33:377)