Transfer Statement

 Copyright Transfer Statement

The copyright to this article is transferred to Springer-Verlag (for U.S. government employees: to the extent transferable) effective if and when the article is accepted for publication. The copyright transfer covers the exclusive right to reproduce and distribute the article, including reprints, translations, photographic reproductions, microform, electronic form (offline, online) or any other reproductions of similar nature.

The author warrants that this contribution is original and that he/she has full power to make this grant. The author signs for and accepts responsibility for releasing thismaterial on behalf of any and all co-authors.

An author may make his/her article published by Springer-Verlag available on his/her personal home page, provided the source of the published article is cited and Springer-Verlag is mentioned as the copyright owner. Authors are requested to create a link to the published article in Springer’s internet service. The link must be accompanied by the following text: ”The original publication is available at http://link.springer.de or at http://link.springer-ny.com”.

Please use the appropriate URL and/or DOI for the article. Articles disseminated via SpringerLink are indexed, abstracted and referenced by many abstracting and information services, bibliographic networks, subscription agencies, library networks, and consortia.

 Title of article:……………………………………………………………………………………..

Author(s):……………………………………………………………………………………………

Author’s signature:………………………………………………………………………………..

Date:………………………………………………………………………………………………….