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English Series The copyright to this article is transferred to Springer-Verlag(for U.S. government employees: to the extenttransferable)effective if and when the article is acceptedfor publication.The copyright transfer covers the exclu-sive right to reproduce and distribute the article,includingreprints, translations, photographic reproductions, micro-form, electronic form(offline,online)or any other repro-ductions of similar nature. The author warrants that this contribution is original andthat he/she has full power to make this grant.The authorsigns for and accepts responsibility for releasing this mater-ial on behalf of any and all co-authors.
English Series The copyright to this article is transferred to Springer-Verlag (for US government employees: to the extenttransferable) effective if and when the article is accepted for publication. The copyright transfer covers the exclu- sive right to reproduce and distribute the article, includingreprints , translations, photographic reproductions, micro-form, electronic form (offline, online) or any other repro-ductions of similar nature. The author warrants that this contribution is original and that he / she has full power to make this grant. authors. for and accepts responsibility for releasing this mater-ial on behalf of any and all co-authors.