An Empirical Comparison of Algorithms to Find Communities in Directed Graphs and Their Application in Web Data Analytics. - Santa Agreste; Pasquale De Meo; Giacomo Fiumara; Giuseppe Piccione; Sebastiano Antonio Piccolo; Domenico Rosaci; Giuseppe M. L. Sarnè; Athanasios V. Vasilakos (IEEE Trans. Big Data, 2017)