Ivanovienė, Irma, and Jonas Rimas. “The Use of Lambert Function Method for Analysis of a Multidimensional Control System With Delays and With Structure of the Complete Graph”. Lietuvos Matematikos Rinkinys, vol. 53, no. A, Dec. 2012, pp. 30–35, https://doi.org/10.15388/LMR.A.2012.06.