@ARTICLE{Ganghoffer_J.F._Extremum_2012,
 author={Ganghoffer, J.F.},
 volume={60},
 number={No 2},
 journal={Bulletin of the Polish Academy of Sciences Technical Sciences},
 pages={259-263},
 howpublished={online},
 year={2012},
 title={Extremum principles for biological continuous bodies undergoing volumetric and surface growth},
 URL={http://ochroma.man.poznan.pl/Content/83546/PDF/11_paper.pdf},
 doi={10.2478/v10175-012-0035-4},
}