@article{SiebertPortmannDoell2012,
  author    = {Stefan Siebert and Felix Theodor Portmann and Petra D{\"o}ll},
  title     = {Global patterns of cropland use intensity},
  journal   = {Remote sensing},
  volume    = {2.2010},
  number    = {7},
  pages     = {1625 -- 1643},
  doi       = {10.3390/rs2071625},
  year      = {2012},
}