@article{AA_2013_25_1_a1,
     author = {M. I. Isaev and R. G. Novikov},
     title = {Stability estimates for recovering the potential by the impedance boundary map},
     journal = {Algebra i analiz},
     pages = {37--63},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2013_25_1_a1/}
}