@article{IM2_2006_70_4_a7,
     author = {D. V. Prokhorov and S. V. Romanova},
     title = {Local extremal problems for bounded analytic functions without zeros},
     journal = {Izvestiya. Mathematics },
     pages = {841--856},
     publisher = {mathdoc},
     volume = {70},
     number = {4},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2006_70_4_a7/}
}