@article{DA_1989_29_a4,
     author = {A. I. Erzin},
     title = {Solution of a knapsack problem},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {41--56},
     publisher = {mathdoc},
     number = {29},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_1989_29_a4/}
}