@article{ZNSL_1978_77_a7,
     author = {P. P. Kulish and A. G. Reiman},
     title = {Hierarchy of symplectic forms for the {Schr\"odinger} and the {Dirac} equations on a line},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {134--147},
     year = {1978},
     volume = {77},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1978_77_a7/}
}