@article{ben1995cooperative, title={Cooperative formation of chiral patterns during growth of bacterial colonies}, author={Ben-Jacob, Eshel and Cohen, Inon and Shochet, Ofer and Tenenbaum, Adam and Czir{\'o}k, Andr{\'a}s and Vicsek, Tam{\'a}s}, journal={Physical review letters}, volume={75}, pages={2899--2902}, year={1995} }