A Wikipedia-Based Multilingual Retrieval Model. Martin Potthast, Benno Stein, and Maik Anderka. ECIR 2008

• Key idea
• Use aligned Wiki articles (concepts) in two languages to map words/documents in different languages into a common concept space.
• Comments
• "A reasonable trade-off between retrieval quality and runtime is achieved for a concept space dimensionality between 1000 and 10000."