@article{ZNSL_1989_179_a1,
     author = {M. I. Belishev and A. P. Katchalov},
     title = {Application of boundary control theory methods to spectral inverse problem for inhomogeneous string},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {14--22},
     publisher = {mathdoc},
     volume = {179},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1989_179_a1/}
}