help 1st step: Please, use the Criterion button. 2nd step: You have to click on one search criterion. (Repeat step 1 and 2 for a combined search.) 3rd step: Enter your search word and use the search button. Normal search x AND OR [+] Criterion [+] Group AND OR [+] Criterion [+] Group search criteria choose all Authordepartment (short)InventorYearPublisherIDJournalKeywordsFree/Open AccessPOF III (all)Reference CategoryTitle (Primary)Title (Secondary)UFZ keywords sort by: Author Year Title (Primary) ID Export: