@article{IM2_2016_80_6_a9,
     author = {A. N. Pechen and N. B. Il'in},
     title = {On extrema of the objective functional for short-time generation of single-qubit quantum gates},
     journal = {Izvestiya. Mathematics },
     pages = {1200--1212},
     publisher = {mathdoc},
     volume = {80},
     number = {6},
     year = {2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2016_80_6_a9/}
}