You seem to be attempting to access an item that has been removed from the repository.
The item you are trying to access was a duplicate of:
Hiemstra, Djoerd and Hauff, Claudia (2010) MapReduce for information retrieval evaluation: "Let's quickly test this on 12 TB of data". In: International Conference of the Cross-Language Evaluation Forum, CLEF: Multilingual and Multimodal Information Access Evaluation, 20-23 September 2010, Padua, Italy (pp. pp. 64-69).