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2

H. Weyl, ``Über gewöhnliche Differentialgleichungen mit Singularitäten und die zugehörige Entwicklungen willkurlicher Funktionen,'' Mathematische Annalen 68 220-269 (1910).

3

K. Nikolsky, ``Das Ozillatorproblem nach der Diracschen Theorie,'' Zeitschrift für Physik 62 677-681 (1930).

4

I. Postepska, ``Harmonische Ozillator nach der Diracschen Wellengleichung.'' Acta Physica Polonica 4 269-280 (1935).

5

G. L. Sewell, ``An approximate relation between the energy levels of a particle in a field of a given potential energy, calculated on the relativislic and non-relativislic theories,'' Proceedings of the Cambridge Philosophical Society 45. 631-637 (1949).

6

E. C. Titchmarsh, ``On the relation between the eigenvalues in relativislic and non-relativistic quantum mechanics,'' Proceedings of the Royal Society, Series A 266, 33-46 (1962); Quarterly Journal of Mathematics 15, 193-207 (1964).

7

Harold V. McIntosh, ``Quantization as an Eigenvalue Problem,'' In Group Theory and Its Applications, Vol. 3, (Ernest M. Loebl Editor), Academic Press, New York (1975), pp. 333-368.

8

Harold V. McIntosh, ``Quantization and Green's Function for Systems of Linear Ordinary Differential Equations,'' In Quantum Science: Methods and Structure, Edited by J. L. Calais, O. Goscinsky. J. Linderberg and Y. Ohrn, Plenum Press, New York (1976) pp. 227-294.

9

Earl A. Coddington and Norman Levinson, Theory of Ordinary Differential Equations, McGraw-Hill Book Company, Inc., New York, 1955.

January 9, 2001