Vitanov, N. K. Max Planck Institute for the Physics of Complex Systems, Max Planck Society;
Vitanov, N. K., Dimitrova, Z. I., & Ausloos, M. (2010). Verhulst-Lotka-Volterra (VLV) model of ideological struggle. Physica A-Statistical Mechanics and its Applications, 389(21), 4970-4980.