@misc{indiciaebec938ca3571,
  title = {Productivity and flowering of winter ephemerals in relation to Sonoran Desert shrubs},
  author = {William L. Halvorson and Duncan T. Patten},
  year = {1975},
  doi = {10.2307/2424164},
  url = {https://pubs.usgs.gov/publication/1007710},
  note = {Source identifier: 1007710}
}