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Yan, B.; Luo, J.: Measuring technological distance for patent mapping (2017)
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Liu, D.-R.; Shih, M.-J.: Hybrid-patent classification based on patent-network analysis (2011)
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Leydesdorff, L.: Patent classifications as indicators of intellectual organization (2008)
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Yan, B.; Luo, J.: Filtering patent maps for visualization of diversification paths of inventors and organizations (2017)
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Lai, K.-K.; Wu, S.-J.: Using the patent co-citation approach to establish a new patent classification system (2005)
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