@article{JCGS.657, title={Bioturbation of freshwater sediments of the Semily Formation (late Carboniferous, Podkrkonosi Basin, Czech Republic)} author={Mikul\'{a}\v{s}, Radek}, journal={Journal of the Czech Geological Society}, volume={38}, number={3-4}, pages={183--187}, year=1993, publisher={Czech Geological Society} }