@article{JCGS.954, title={Two new gastropod genera (Porcellioidea, Archaeogastropoda) from the Lower Carboniferous of Belgium} author={Fr\'{y}da, Ji\v{r}\'{i}}, journal={Journal of the Czech Geological Society}, volume={49}, number={1-2}, pages={57--61}, year=2004, publisher={Czech Geological Society} }