Eberl, K.Kirpichev, V. E.Klitzing, K. vonKukushkin, I. V.Kulik, L. V.2004-12-102004-12-1020012001http://hdl.handle.net/2003/1850010.17877/DE290R-16144enThe American Physical SocietyPhysical Review Letters530Modification of the Intersubband Excitation Spectrum in a Two-Dimensional Electron System under a Perpendicular Magnetic Field10.1103/PhysRevLett.86.1837article (journal)