@article{Liu2017, author = "Jian-Guo Liu and Xiao-Lu Liu and Qiang Guo and Jing-Ti Han", title = "{(Color online) Degree evolution 〈ρO(t)〉 of two divided object groups (a,b) and the ratio ϕ of rewarded objects in two divided object groups with different parameter q (c,d) for two empirical data sets, in which the time t is measured in days, and the parameter θ is set to 0.3 and 0.6 for the MovieLens and Netflix data sets, respectively.}", year = "2017", month = "7", url = "https://plos.figshare.com/articles/figure/_Color_online_Degree_evolution_i_i_sub_i_O_i_sub_i_t_i_of_two_divided_object_groups_a_b_and_the_ratio_i_i_of_rewarded_objects_in_two_divided_object_groups_with_different_parameter_i_q_i_c_d_for_two_empirical_data_sets_in_which_the_time_i_t_i_is_measured_i/5204503", doi = "10.1371/journal.pone.0178118.g001" }