@article{AA_1989_1_4_a2,
     author = {V. I. Vasyunin and S. R. Treil'},
     title = {The inverse spectral problem for the modulus of {a~Hankel} operator},
     journal = {Algebra i analiz},
     pages = {54--66},
     publisher = {mathdoc},
     volume = {1},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1989_1_4_a2/}
}