This strange Exorcism case is from Germany between 1969 and 1976. Her story became the inspiration for the theatrical film 'The Exorcism of Emily Rose'.
Annelise requested that the Exorcist audio tapes be released for study.
Hell is Real. (1991) ABC's 20/20, with Hugh Downs and Barbara Walters, investigates a real Roman Catholic Exorcism, in Four Parts:
Part 1 Part 2