@article{Wilhelm:2009,
author
=
"T.Wilhelm and K.Wilmański",
title
=
"On the onset of flow instabilities in granular media due to porosity inhomogeneities",
journal
=
"International Journal of Multiphase Flow",
volume
=
"Vol. 28",
pages
=
"1929--1944",
year
=
"2002",
}