%0 Journal Article %A A. N. Pechen %A N. B. Il'in %T Existence of traps in the problem of maximizing quantum observable averages for a qubit at short times %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 2015 %P 227-234 %V 289 %I mathdoc %U http://geodesic.mathdoc.fr/item/TM_2015_289_a12/ %G ru %F TM_2015_289_a12