Books (50) E-Books (70) Articles (Online) (5230) OpenAccess-fulltext (15291) more... Thesis (3) Bookchapter (Print) (8) Articles (Print) (5) Audio (DVD/CD) (4) Thesis (Online) (5) Video (DVD/CD) (3) Bookchapter (Online) (291) Audio (Online) (4) less...
german (31) english (9833) more... spanish (7239) italian (62) french (62) portuguese (394) latin (7) russian (1) less...