Sacha, KrzysztofZakrzewski, Jakub2004-12-142004-12-1420012001http://hdl.handle.net/2003/1861310.17877/DE290R-16243enThe American Physical SocietyPhysical Review Letters530Driven Rydberg Atoms Reveal Quartic Level Repulsion10.1103/PhysRevLett.86.2269article (journal)