This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article provides insufficient context for those unfamiliar with the subject. Please help improve the article by providing more context for the reader. (July 2015) (Learn how and when to remove this message) This article does not cite any sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: "Valentin Otto" – news · newspapers · books · scholar · JSTOR (July 2015) (Learn how and when to remove this message) (Learn how and when to remove this message)