@article{RM_2015_70_4_a6,
     author = {A. N. Pechen and N. B. Il'in},
     title = {On critical points of the objective functional for maximization of qubit observables},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {782--784},
     publisher = {mathdoc},
     volume = {70},
     number = {4},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2015_70_4_a6/}
}