Additional information
Funding
S. K. Nagel acknowledges the “Sievert Stiftung für Wissenschaft und Kultur” (S248/10006/2013) for its financial support.
Please note: We are unable to provide a copy of the article, please see our help page How do I view content?
To request a reprint or commercial or derivative permissions for this article, please click on the relevant link below.
Permission can also be obtained via Rightslink. For more information please visit our Permissions help page.
People also read lists articles that other readers of this article have read.
Recommended articles lists articles that we recommend and is powered by our AI driven recommendation engine.
Cited by lists all citing articles based on Crossref citations.
Articles with the Crossref icon will open in a new tab.
Register now or learn more