Published in
Advanced Studies in Theoretical Physics, (8), p. 771-779
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The procedure of finding the stress-energy tensor and equations of vector field of any form
Journal article published in 2014 by
Sergey G. Fedosin 
Abstract
A method allowing us to introduce into the Lagrangian the terms, which characterize an arbitrary vector field of a system, is described. As a result of applying the principle of least action it becomes possible to find all the main characteristics of this field, including its energy and momentum, field equations, force of interaction with the matter.