@ARTICLE{Wojnar_R._Boussinesq_2010,
 author={Wojnar, R.},
 volume={58},
 number={No 1},
 journal={Bulletin of the Polish Academy of Sciences Technical Sciences},
 pages={165-170},
 howpublished={online},
 year={2010},
 title={Boussinesq equation for flow in an aquifer with time dependent porosity},
 URL={http://journals.pan.pl/Content/83033/PDF/17_paper.pdf},
 doi={10.2478/v10175-010-0017-3},
}