@article{AA_2001_13_4_a9,
     author = {R. G. Shterenberg},
     title = {Absolute continuity of spectra of two-dimensional periodic {Schr\"odinger} operators with positive electric potentials},
     journal = {Algebra i analiz},
     pages = {196--228},
     publisher = {mathdoc},
     volume = {13},
     number = {4},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2001_13_4_a9/}
}