@article{TMF_1989_80_2_a8,
     author = {I. Yu. Krivsky and V. M. Simulik},
     title = {Noether analysis of~zilch conservation laws and their generalization for the electromagnetic field. {I.~Use} of~different formulations of~the principle of~least action},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {274--287},
     publisher = {mathdoc},
     volume = {80},
     number = {2},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1989_80_2_a8/}
}