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Van der Walt, M.: South African search engines, directories and portals : a survey and evaluation (2000)
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Joint, N.: Evaluating the quality of library portals (2005)
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Negm, E.; AbdelRahman, S.; Bahgat, R.: PREFCA: a portal retrieval engine based on formal concept analysis (2017)
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Large, A.; Beheshti, J.; Rahman, T.: Design criteria for children's Web portals : the users speak out (2002)
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Neuroth, H.; Pianos, T.: VASCODA: a German scientific portal for cross-searching distributed digital resource collections (2003)
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