@article{VTAMU_2019_24_127_a1,
     author = {P. Butkovic and H. Schneider and S. Sergeev},
     title = {Core of a matrix in max algebra and in nonnegative algebra: a survey},
     journal = {Vestnik rossijskih universitetov. Matematika},
     pages = {252--271},
     year = {2019},
     volume = {24},
     number = {127},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTAMU_2019_24_127_a1/}
}