@misc{indiciaec1ecd3511a61,
  title = {A five-year analysis of MODIS NDVI and NDWI for grassland drought assessment over the central Great Plains of the United States},
  author = {Yingxin Gu and Jesslyn F. Brown and J. P. Verdin and B. Wardlow},
  year = {2007},
  doi = {10.1029/2006gl029127},
  url = {https://pubs.usgs.gov/publication/70030166},
  note = {Source identifier: 70030166}
}