@article{1256054217, author = {Putnam, C. R.}, title = {Eigenvalues and boundary spectra}, journal = {Illinois J. Math.}, volume = {12}, number = {4}, year = {1968}, pages = { 278-282}, language = {en}, url = {http://dml.mathdoc.fr/item/1256054217} }
Putnam, C. R. Eigenvalues and boundary spectra. Illinois J. Math., Tome 12 (1968) no. 4, pp. 278-282. http://gdmltest.u-ga.fr/item/1256054217/