E-Books (74) Books (32) Articles (Online) (20006) OpenAccess-fulltext (24103) more... Thesis (Online) (21) Video (DVD/CD) (27) Bookchapter (Print) (15) Thesis (2) Articles (Print) (13) Bookchapter (Online) (1980) Video (Online) (1) less...
english (35138) german (59) more... french (21) spanish (13) russian (14) norwegian (1) portuguese (2) swedish (3) less...