@article{IVM_1967_4_a8,
     author = {I. D. Novikov},
     title = {The spectra of quadratic operators of second quantization},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {64--68},
     publisher = {mathdoc},
     number = {4},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1967_4_a8/}
}