E-Books (57) Books (11) Articles (Online) (8948) OpenAccess-fulltext (24577) more... Thesis (Online) (4) Video (DVD/CD) (11) Bookchapter (Print) (13) Thesis (2) Bookchapter (Online) (554) Articles (Print) (3) Audio (Online) (10) Video (Online) (2) less...
english (20824) german (32) more... spanish (8790) portuguese (84) french (8) italian (1) swedish (1) russian (1) less...