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==Literature==
*{{cite journal |author=Weyl, H. |title=Gravitation und Elektrizität |journal=Sitzungsberichte der Preuss. Akad. D. Wiss. |year=1918 |pages=
* [http://qjmath.oxfordjournals.org/cgi/reprint/os-20/1/135.pdf A.G. Walker: ''On parallel fields of partially null vector spaces'']{{dead link|date=January 2025|bot=medic}}{{cbignore|bot=medic}}, The Quarterly Journal of Mathematics 1949, Oxford Univ. Press
* [http://qjmath.oxfordjournals.org/cgi/reprint/2/1/151.pdf E.M. Patterson: ''On symmetric recurrent tensors of the second order'']{{dead link|date=January 2025|bot=medic}}{{cbignore|bot=medic}}, The Quarterly Journal of Mathematics 1950, Oxford Univ. Press
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