@article{IM2_1991_37_3_a7,
     author = {L. A. Pastur and V. A. Tkachenko},
     title = {An inverse problem for a class of one-dimensional {Shrodinger} operators with a complex periodic potential},
     journal = {Izvestiya. Mathematics },
     pages = {611--629},
     publisher = {mathdoc},
     volume = {37},
     number = {3},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1991_37_3_a7/}
}