1. E. Schrödinger. Ann. Phys. 80, 437 (1926). [In German.] 10.1002/andp.19263851302.
2. E. Schrödinger. Ann. Phys. 79, 361 (1926). [In German.] 10.1002/andp.19263840404.
3. E. Schrödinger. Ann. Phys. 79, 489 (1926). [In German.] 10.1002/andp.19263840602.
4. E. Schrödinger. Four lectures on wave mechanics. Blackie & Son Limited, London. 1928.
5. P.A.M. Dirac. The principles of quantum mechanics. Clarendon Press, Oxford. 1930.