@article{firstassessmentoftheplantphenologyindex,
  title = {First assessment of the plant phenology index (PPI) for estimating gross primary productivity in African semi-arid ecosystems},
  year = {2019},
  eprint = {1902.08058},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1902.08058v1},
}