@article{1102945095, author = {Brooks, R. M.}, title = {Analytic structure in the spectrum of a natural system.}, journal = {Pacific J. Math.}, volume = {49}, number = {2}, year = {1973}, pages = { 315-334}, language = {en}, url = {http://dml.mathdoc.fr/item/1102945095} }
Brooks, R. M. Analytic structure in the spectrum of a natural system.. Pacific J. Math., Tome 49 (1973) no. 2, pp. 315-334. http://gdmltest.u-ga.fr/item/1102945095/