Geodesic
The method of~collective variables and the generalized Hamiltonian formalism
Teoretičeskaâ i matematičeskaâ fizika, Tome 45 (1980) no. 1, pp. 46-53

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N. N. Bogoliubov's transformations leading to the Lagrangian with constraints are considered in the framework of the generalised Hamiltonian theory due to Dirac. An expression for the $S$-matrix is derived using the path integrals over the phase space. 
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     author = {A. V. Shurgaya},
     title = {The method of~collective variables and the generalized {Hamiltonian} formalism},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     number = {1},
     year = {1980},
     language = {ru},
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A. V. Shurgaya. The method of~collective variables and the generalized Hamiltonian formalism. Teoretičeskaâ i matematičeskaâ fizika, Tome 45 (1980) no. 1, pp. 46-53. http://geodesic.mathdoc.fr/item/TMF_1980_45_1_a3/