@article{ZNSL_1987_157_a15,
     author = {A. V. Lipin},
     title = {The spectral multiplicity of the solutions of polynomial operator equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {157--164},
     publisher = {mathdoc},
     volume = {157},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_157_a15/}
}