@article{Del161836, author = "E. Del Val and C. Martínez and V. Botti", title = "{A}nalyzing {U}sers’ {A}ctivity in {O}n-line {S}ocial {N}etworks over {T}ime through a {M}ulti-{A}gent {F}ramework", journal = "Soft Computing", year = "2016"}