@article{szabo2009transitions, title={Transitions in a self-propelled-particles model with coupling of accelerations}, author={Szab{\'o}, P{\'e}ter and Nagy, M{\'a}t{\'e} and Vicsek, Tam{\'a}s}, journal={Physical Review E}, volume={79}, number={2}, pages={021908}, year={2009}, publisher={APS} }