@article{IM2_1989_33_3_a3,
     author = {A. S. Matveev},
     title = {Optimal control problems with delays of general form and with phase constraints},
     journal = {Izvestiya. Mathematics },
     pages = {521--552},
     publisher = {mathdoc},
     volume = {33},
     number = {3},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1989_33_3_a3/}
}