@article{ND_2020_16_3_a0,
     author = {A. S. Osipov},
     title = {Inverse {Spectral} {Problems} for {Second-Order
}},
     journal = {Russian journal of nonlinear dynamics},
     pages = {397--419},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ND_2020_16_3_a0/}
}