@misc{Praszkier_Tomasz_Bogdański_Jacek_Siuda_Rafał_Agates_2011,
 author={Praszkier Tomasz, Bogdański Jacek, Siuda Rafał},
 address={Warszawa, Polska},
 howpublished={online},
 year={2011},
 publisher={Spirifer Geological Society},
 title={Agates from Płóczki Górne},
}