[1] Courant R. D. Hilbert: 
Methods of mathematical physics. Vol. I, New York (1953) 
MR 0065391[2] Dieudonné J.: 
Foundations of modern analysis. New York (1960) 
MR 0120319[3] Gelfand I. M. S. Fomin: Calculus of variations. New Jersey (1967)
[5] Landau L. D. E. M. Lifshitz: 
Mechanics. Pergamon Press (1969) 
MR 0475051[6] Mickevich N. V.: Physical fields in the general relativity theory. Moscow 1969 (Russian)
[7] Śniatycki J.: 
On the geometric structure of classical field theory in Lagrangian formulation. Proc. Camb. Phil. Soc. (1970), 68, 475-484 
MR 0261936[8] Trautman A.: 
Noether equations and conservation laws. Commun.  Math. Phys. 6 (1967), 248-261 
MR 0220470 | 
Zbl 0172.27803[9] Trautman A.: 
Conservation laws in general relativity. in: Gravitation, New York (1962) 
MR 0143627