@article{DAN_1989_308_4_a1,
     author = {P. I. Dudnikov and S. N. Samborskii},
     title = {Spectra of endomorphisms of semimodules over semirings with an},
     journal = {Doklady Akademii Nauk},
     pages = {780--783},
     publisher = {mathdoc},
     volume = {308},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_308_4_a1/}
}