@article{ZNSL_1979_90_a11,
     author = {K. V. Shakhbazyan},
     title = {The ordering of structural set of tasks minimizing the total cost},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {229--264},
     publisher = {mathdoc},
     volume = {90},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1979_90_a11/}
}