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• [2] Émile Cotton, Sur les solutions asymptotiques des équations différentielles, Ann. Sci. École Norm. Sup. (3) 28 (1911), 473–521 (French). MR 1509144
• [3] William Benjamin Fite, Concerning the zeros of the solutions of certain differential equations, Trans. Amer. Math. Soc. 19 (1918), no. 4, 341–352. MR 1501107, https://doi.org/10.1090/S0002-9947-1918-1501107-2
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• [5] Adolf Kneser, Untersuchungen über die reellen Nullstellen der Integrale linearer Differentialgleichungen, Math. Ann. 42 (1893), no. 3, 409–435 (German). MR 1510784, https://doi.org/10.1007/BF01444165
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• [7] B. Riemann-H. Weber, Die partiellen Differentialgleichungen der Mathematischen Physik, vol. II, 5th ed., Braunschweig, 1912, xiv+575 pp.
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• [9] A. Wiman, Über die reellen Lösungen der linearen Differentialgleichungen zweiter Ordnung, Arkiv för Matematik, Astronomi och Fysik vol. 12, no. 14 (1917) 22 pp.
• [10] Aurel Wintner, On the Laplace-Fourier transcendents occurring in mathematical physics, Amer. J. Math. 69 (1947), 87–98. MR 19182, https://doi.org/10.2307/2371656

Bibliography

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R. Bellman, The boundedness of solutions of linear differential equations, Duke Math. J. vol. 14 (1947) 83-97. MR 0021189 (9:35b)

[2]

E. Cotton, Sur les solutions asymptotiques des équations différentielles, Ann. École Norm. (3) vol. 28 (1911) pp. 473-521. MR 1509144

[3]

W. B. Fite, Concerning the zeros of the solutions of certain differential equations, Trans. Amer. Math. Soc. vol. 19 (1917) pp. 341-352. MR 1501107

[4]

E. Hille, A general type of singular point, Proc. Nat. Acad. Sci. U.S.A. vol. 10 (1924) pp. 488-493.

[5]

A. Kneser, Untersuchungen über die reellen Nullstellen der Integrale linearer Differentialgleichungen, Math. Ann vol. 42 (1893) pp. 409-435. MR 1510784

[6]

N. Levinson, The growth of the solutions of a differential equation, Duke Math. J. vol. 8 (1941) pp. 1-10. MR 0003887 (2:287f)

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B. Riemann-H. Weber, Die partiellen Differentialgleichungen der Mathematischen Physik, vol. II, 5th ed., Braunschweig, 1912, xiv+575 pp.

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G. N. Watson, A treatise on the theory of Bessel functions, Camridge, 1944, viii+804pp. MR 0010746 (6:64a)

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A. Wiman, Über die reellen Lösungen der linearen Differentialgleichungen zweiter Ordnung, Arkiv för Matematik, Astronomi och Fysik vol. 12, no. 14 (1917) 22 pp.

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A. Wintner, On the Laplace-Fourier transcendents occurring in mathematical physics, Amer. J. Math. vol. 69 (1947) pp. 87-98. MR 0019182 (8:381d)