@ARTICLE{Kowalska_Anna_Recruiting_2011,
 author={Kowalska, Anna},
 number={No 11c},
 journal={Teka Commission of Motorization and Power Industry in Agriculture},
 howpublished={online},
 year={2011},
 publisher={The Lublin Branch of the Polish Academy of Sciences},
 title={Recruiting And Using Agricultural Biogas},
}