@article{RM_2002_57_1_a12,
     author = {N. V. Ustinov and Yu. V. Brezhnev},
     title = {On the $\Psi$-function for finite-gap potentials},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {165--167},
     publisher = {mathdoc},
     volume = {57},
     number = {1},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2002_57_1_a12/}
}