Ricardo A. Baeza-Yates, und Berthier Ribeiro-Neto. Modern Information Retrieval. Addison-Wesley Longman Publishing Co., Inc., Boston, MA, USA, 1999. [PUMA: book information ir retrieval web] URL
Stanislaw Lem. Sterntagebücher. Suhrkamp, 2003. [PUMA: book buch buy fiction kaufen lem science wishlist] URL