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References

1. C. Eckart, Some studies concerning rotating axes and polyatomic molecules, Physical Review 47 552-558 (1935).
2. C. Eckart and G. Young, The approximation of one matrix by another of lower rank, Psychometrika 1(3) 211-218 (1936).
3. Eckart Biography – The National Academies Press http://orsted.nap.edu/openbook.php?record_id=571&page=194
4. Eckart Papers – Library of Congress http://lcweb2.loc.gov/cgi-bin/query/r?faid/faid:@field(DOCID+ms001014)
5. Author Catalog: Eckart – American Philosophical Society http://www.amphilsoc.org/library/guides/ahqp/
6. K. T. Compton and Carl Eckart The Diffusion of Electrons Against an Electric Field in the Non-Oscillatory Abnormal Low Voltage Arc, Phys. Rev. 25 (2) 139 - 146 (1925). Palmer Physical Laboratory, Princeton, New Jersey, Received 29 October 1924.
7. Heisenberg was granted his doctorate under Arnold Sommerfeld at the Ludwig Maximilians University of Munich in 1923 and completed his Habilitation under Max Born at the Georg-August University of Göttingen in 1924.
8. Erwin Schrödinger (From the German) Quantization as an Eigenvalue Problem (First Communication), Annalen der Physik 79 (4) 361-376, 1926. [English translation in Gunter Ludwig Wave Mechanics 94-105 (Pergamon Press, 1968) ISBN:0-08-203204-1]
9. Erwin Schrödinger (From the German) Quantization as an Eigenvalue Problem (Second Communication), Annalen der Physik 79 (6) 489-527, 1926. [English translation in Gunter Ludwig Wave Mechanics 106-126 (Pergamon Press, 1968) ISBN:0-08-203204-1]
10. Erwin Schrödinger (From the German) Quantization as an Eigenvalue Problem (Third Communication), Annalen der Physik 80 (13) 437-490, 1926.
11. Erwin Schrödinger (From the German) Quantization as an Eigenvalue Problem (Fourth Communication), Annalen der Physik 81 (18) 109-139, 1926. [English translation in Gunter Ludwig Wave Mechanics 151-167 (Pergamon Press, 1968) ISBN:0-08-203204-1]
12. Eckart Paper – Carl Eckart The Solution of the Problem of the Simple Oscillator by a Combination of the Schrödinger and the Lanczos Theories, Proceedings of the National Academy of Sciences of the United States of America 12 473-476 (1926). California Institute of Technology. Communicated May 31, 1926. http://www.pnas.org/cgi/reprint/12/7/473.pdf
13. Erwin Schrödinger Über das Verhältnis der Heisenberg-Born-Jordanschen Quantenmechanik zu der meinen (Translated from the German: On the Relationship of the Heisenberg-Born-Jordan Quantum Mechanics to Mine) Annalen der Physik 79 (8) 734-756, 1926. Received March 18, 1926. [English translation in Gunter Ludwig Wave Mechanics 127-150 (Pergamon Press, 1968) ISBN:0-08-203204-1]
14. Arnold Sommerfeld Some Reminiscences of My Teaching Career, American Journal of Physics 17 (5) 315-316 (1949)
15. Sommerfeld Biography – American Philosophical Society http://www.amphilsoc.org/library/guides/ahqp/bios.htm
16. A. Sommerfeld, W. V. Houston, and C. Eckart, Zeits. f. Physik 47, 1 (1928)
17. Werner Heisenberg, Translated by Carl Eckart and F. C. Hoyt The Physical Principles of the Quantum Theory (Dover, 1930)
18. Uranium Committee http://www.atomicarchive.com/Docs/SmythReport/smyth_iii.shtml
19. DTIC http://stinet.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0200786