@article{articlea27d1b84,
title   = {Chaos in two-loop negative feedback systems},
author = {Figueiredo, J C Bastos de and Diambra, L and Glass, Leon and Malta, Coraci Pereira},
year = {2002},
doi = {10.1103/physreve.65.051905},
journal   = {Physical Review C}
}