@article{DE_1989_25_3_a0,
     author = {L. E. Zabello},
     title = {On the theory of necessary conditions for optimality with delay and a derivative of the control},
     journal = {Differencialʹnye uravneni\^a},
     pages = {371--379},
     publisher = {mathdoc},
     volume = {25},
     number = {3},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_3_a0/}
}