- ^ Senousy, M.B.; Abdallah, W. K. (2011). "Investigation of free open source Search Engines". In Silhavy, Radek; Silhavy, Petr; Prokopova, Zdenka; Oplatkova, Zuzana (eds.). Computer Science and Software Techniques in 2011. Vsetín. pp. 144–168. ISBN 978-80-904741-0-9.
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