@article{TM_2015_289_a12,
     author = {A. N. Pechen and N. B. Il'in},
     title = {Existence of traps in the problem of maximizing quantum observable averages for a qubit at short times},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {227--234},
     publisher = {mathdoc},
     volume = {289},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2015_289_a12/}
}