@inproceedings{KalinkaAhrens2012,
  author    = {Frank Kalinka and Bodo Ahrens},
  title     = {A modification of the mixed form of Richards equation and its application in vertically inhomogeneous soils},
  booktitle = {Advances in science and research},
  volume    = {6},
  pages     = {123 -- 127},
  doi       = {10.5194/asr-6-123-2011},
  year      = {2012},
}