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Perez, E.: Zyindex: quick and not-to-dirty text databases (1992)
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Stewart, W.L.: ZyINDEX 5.0 for Windows, by ZyLAB Division of Information Dimensions, Inc (1994)
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Collier, H.: Cool, cool searching (1996)
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Gillman, P.: Data handling and text compression (1992)
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Robertson, S.E.; Sparck Jones, K.: Simple, proven approaches to text retrieval (1997)
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