http://www.doi.org Fetch content object via Digital Object Identifier e.g. scientific papers. http://dx.doi.org/{query} http://www.doi.org/tools/doilookup_button_for_google_toolbar.xml http://dx.doi.org/{selection} R0lGODlhEAAQALMPAPP1+RkwXidOnXGU2ztry46p30960MfS5t7m9YWg2ae96U1df2GH0v///zNm zP///yH5BAEAAA8ALAAAAAAQABAAAARs8MmHCiOOFTS7wk4YEkrXDA5hiOzQSEXIAAXIFpTINA2C so6Kjsc7MG4rGZH4CRlsuyWPloJKixjVcIlYBAICQ0w5ZXzBggRiWzijCZwx4+D9CgQh3OOUEpzx IQMAHgR3gCklHRIICUliHBMRADs=