?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Kijko%2C+Andrzej&rft.aulast=Kijko&rft.aufirst=Andrzej&rft.issue=2&rft.volume=XXXV&rft.date=1987&rft.issn=1895-6572&rft.atitle=BIMODAL+character+of+the+distribution+of+extreme+seismic+events+in+Polish+mines&rft.title=Acta+Geophysica+Polonica&rft.pages=157-166&rft.genre=article