Books (27) E-Books (17) Articles (Online) (1841) OpenAccess-fulltext (5828) more... Bookchapter (Print) (9) Video (DVD/CD) (4) Articles (Print) (14) Thesis (Online) (7) Thesis (5) Bookchapter (Online) (59) Audio (Online) (6) less...
german (178) english (6179) more... portuguese (6) polish (34) swedish (6) spanish (7) russian (1) italian (2) less...