@article{IVM_2020_9_a4,
     author = {L. N. Krivonosov and V. A. Luk"yanov},
     title = {Specificity of {Petrov} classification of (anti-)self-dual zero signature metrics},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {56--67},
     publisher = {mathdoc},
     number = {9},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2020_9_a4/}
}