@article{IVM_2000_6_a4,
     author = {M. I. Sumin},
     title = {Suboptimal control of semilinear elliptic equations with phase {constraints.~I.} {The} maximum principle for minimizing sequences and normality},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {33--44},
     publisher = {mathdoc},
     number = {6},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2000_6_a4/}
}