An author may self-archive an author-created version of his/her article on his/her own website and his/her institution’s repository, including his/her final version; however he/she may not use the publisher’s PDF version which is posted on www.scichina.com and www.springerlink.com (English version only). Furthermore, the author may only post his/her version provided acknowledgement is given to the original source of publication and a link is inserted to the published article on SCP’s and Springer’s websites. The link must be accompanied by the following text: “The original publication is available at www.scichina.com and www.springerlink.com”.
Please use the appropriate DOI for the article.