@article{AA_2013_25_4_a5,
     author = {D. A. Kovtonyuk and I. V. Petkov and V. I. Ryazanov and R. R. Salimov},
     title = {The boundary behavior and the {Dirichlet} problem for the {Beltrami} equations},
     journal = {Algebra i analiz},
     pages = {101--124},
     publisher = {mathdoc},
     volume = {25},
     number = {4},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2013_25_4_a5/}
}