@misc{919,
  author = {NW Calderone},
  title = {Insect pollinated crops, insect pollinators and US agriculture: trend analysis of aggregate data for the period 1992-2009},
  year = {2012},
  url = {https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0037235},
  language = {eng},
}