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Margaris D, Vasilopoulos D, Vassilakis C, Spiliotopoulos D.  2019.  Improving Collaborative Filtering’s Rating Prediction Coverage in Sparse Datasets through the Introduction of Virtual Near Neighbors. Proceedings of the 10th International Conference on Information, Intelligence, Systems and Applications (IISA2019).
Margaris D, Vassilakis C.  2020.  Improving collaborative filtering’s rating prediction coverage in sparse datasets by exploiting the “friend of a friend” concept. International Journal of Big Data Intelligence. 7(1)
Margaris D, Vassilakis C, Spiliotopoulos D.  2022.  On Producing Accurate Rating Predictions in Sparse Collaborative Filtering Datasets. Information. 13:302.
Margaris D, Vassilakis C.  2018.  Improving Collaborative Filtering's Rating Prediction Coverage in Sparse Datasets by Exploiting User Dissimilarity. 2018 IEEE 16th Intl Conf on Dependable, Autonomic and Secure Computing, 16th Intl Conf on Pervasive Intelligence and Computing, 4th Intl Conf on Big Data Intelligence and Computing and Cyber Science and Technology Congress(DASC/PiCom/DataCom/CyberSciTech).
Margaris D, Spiliotopoulos D, Karagiorgos G, Vassilakis C, Vasilopoulos D.  2021.  On Addressing the Low Rating Prediction Coverage in Sparse Datasets Using Virtual Ratings. SN Computer Science. 2:255.
Margaris D, Spiliotopoulos D, Karagiorgos G, Vassilakis C.  2020.  An Algorithm for Density Enrichment of Sparse Collaborative Filtering Datasets Using Robust Predictions as Derived Ratings. Algorithms. 13:174.
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Sgardelis K, Margaris D, Spiliotopoulos D, Vassilakis C.  2024.  Experimental results for Evaluating User Similarity Metrics in Sparse Collaborative Filtering Datasets. SODA Lab Technical Reports.