Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Passage: N. Marwan, M. Romano, M. Thiel and J. Kurths, "Recurrence Plots for the Analysis of Complex Systems", Phys. Rep. 438, 240-329 (2007)  Ajụjụ: Ndị dere ya bụ Marwan, Romano, Kurths na ndị ọzọ?
Mkpụrụ osisi Thiel