@article{VMUMM_1988_1_a5,
     author = {B. M. Levitan and A. V. Savin},
     title = {An inverse problem on the half line for finite-gap potentials},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {21--28},
     year = {1988},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1988_1_a5/}
}