@article{DA_2015_22_4_a2,
     author = {E. A. Kazakovtseva and V. V. Servakh},
     title = {The complexity of the project scheduling problem with credits},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {35--49},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2015_22_4_a2/}
}