Skrypnik, W. I. “Solutions of the Kirkwood–Salsburg Equation for a Lattice Classical System of One-Dimensional Oscillators With Positive Finite-Range Many-Body Interaction Potentials”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 60, no. 10, Oct. 2008, pp. 1427–1433, https://umj.imath.kiev.ua/index.php/umj/article/view/3257.