Lindner, MarkoMarkoLindnerBöttcher, AlbrechtAlbrechtBöttcher2021-10-252021-10-252008Scholarpedia 3 (3): 2680- (2008)http://hdl.handle.net/11420/10585en1941-6016200832680MathematikJournal Article10.4249/scholarpedia.2680Other