@article{IVM_1989_4_a9,
     author = {S. Ya. Serovaǐskiǐ},
     title = {Quasiconjugate systems and necessary conditions for optimality in nonlinear infinite-dimensional systems},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {61--69},
     publisher = {mathdoc},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1989_4_a9/}
}