@article{SM_2012_203_4_a5,
     author = {G. G. Magaril-Il'yaev and E. O. Sivkova},
     title = {Best recovery of the {Laplace} operator of a~function from incomplete spectral data},
     journal = {Sbornik. Mathematics},
     pages = {569--580},
     publisher = {mathdoc},
     volume = {203},
     number = {4},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2012_203_4_a5/}
}