@misc{indiciaeffe6497bd16c,
  title = {Hydrologic drought of water year 2011 compared to four major drought periods of the 20th century in Oklahoma},
  author = {Molly J. Shivers and William J. Andrews},
  year = {2013},
  doi = {10.3133/sir20135018},
  url = {https://pubs.usgs.gov/publication/sir20135018},
  note = {Source identifier: sir20135018}
}