@article{ZNSL_1973_37_a5,
     author = {L. A. Takhtadzhyan},
     title = {Hamiltonian systems connected with the {Dirac} equation},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {66--76},
     publisher = {mathdoc},
     volume = {37},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1973_37_a5/}
}