@article{Rajnik_2009, title={Professor Bernard Piotrowski zum 70. Geburtstag}, volume={10}, url={https://pressto.amu.edu.pl/index.php/fsp/article/view/3563}, journal={Folia Scandinavica Posnaniensia}, author={Rajnik, Eugeniusz}, year={2009}, month={Jan.}, pages={5–10} }