@article{PDM_2016_3_a4,
     author = {A. M. Magomedov},
     title = {Chain structures in schedules tasks},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {67--77},
     publisher = {mathdoc},
     number = {3},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2016_3_a4/}
}