Skrypnik, W. I. “On an Unbounded Order Parameter in Lattice Equilibrium GKS-Type Oscillator Systems”. Ukrains’kyi Matematychnyi Zhurnal 61, no. 4 (April 25, 2009): 538-547. Accessed January 28, 2023. https://umj.imath.kiev.ua/index.php/umj/article/view/3038.