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Wittmann, A.: Classifying and indexing of patent documents : a retired patent documentalist looks back (1994)
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Schweikhardt, F.: Some thoughts on hybrid systems especially for patent documentation (1989)
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Dickens, D.T.: ¬The ECLA classification system (1994)
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Cetintas, S.; Si, L.: Effective query generation and postprocessing strategies for prior art patent search (2012)
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Kang, I.-S.; Na, S.-H.; Kim, J.; Lee, J.-H.: Cluster-based patent retrieval (2007)
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