@article{10_4064_ba57_2_11,
     author = {A. G. Ramm},
     title = {On the {Relation} between the $S$-matrix and the {Spectrum} of the {
Interior} {Laplacian}},
     journal = {Bulletin of the Polish Academy of Sciences. Mathematics},
     pages = {181--188},
     publisher = {mathdoc},
     volume = {57},
     number = {2},
     year = {2009},
     doi = {10.4064/ba57-2-11},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ba57-2-11/}
}