@article{KaiserBerheSommeretal.2012,
  author    = {Michael Kaiser and Asmeret Asefaw Berhe and Michael Sommer and Markus Kleber},
  title     = {Application of ultrasound to disperse soil aggregates of high mechanical stability},
  journal   = {Journal of plant nutrition and soil science = Zeitschrift f{\"u}r Pflanzenern{\"a}hrung und Bodenkunde},
  volume    = {175},
  number    = {4},
  pages     = {521 -- 526},
  doi       = {10.1002/jpln.201200077},
  year      = {2012},
}