Fisher Waves and the Velocity of Front Propagation in a Two-Species   Invasion Model with Preemptive Competition
  We consider an individual-based two-dimensional spatial model with nearest-neighbor preemptive competition to study front propagation between an invader and a resident species. In particular, we investigate the asymptotic front velocity and compare it with mean-field predictions. 
L. O'Malley, B. Kozma, G. Korniss, Z. Racz, and T. Caraco