@article{DA_1989_29_a0,
     author = {A. A. Ageev},
     title = {Graphs, matrices and an elementary location problem},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {3--10},
     year = {1989},
     number = {29},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_1989_29_a0/}
}