@article{SM_1990_67_1_a1,
     author = {M. I. Belishev},
     title = {Wave bases in multidimensional inverse problems},
     journal = {Sbornik. Mathematics},
     pages = {23--42},
     year = {1990},
     volume = {67},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1990_67_1_a1/}
}