@article{DA_2011_18_6_a3,
     author = {D. S. Malyshev and V. E. Alekseev},
     title = {Boundary classes for the list-ranking problems in subclasses of forests},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {61--70},
     publisher = {mathdoc},
     volume = {18},
     number = {6},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2011_18_6_a3/}
}