Robustness, Stability and Efficiency of Phage lambda Gene Regulatory   Network: Dynamical Structure Analysis
  Based on our physical and biological studies we have recently developed a mathematical framework for the analysis of nonlnear dynamics. We call this framework the dynamical structure analysis. It has four dynamical elements: potential landscape, transverse matrix, descendant matrix, and stochastic drive. In particular, the importance and the existence of the potential landscape is emphasized.   The dynamical structure analysis is illustrated in detail by the study of stability, robustness, and efficiency of the simplest gene regulatory network of phage lambda. 
X.-M. Zhu, L. Yin, L. Hood, and P. Ao