@misc{indiciaef87c5d4ad19b,
  title = {Natural inflation with pseudo Nambu-Goldstone bosons},
  author = {Freese, Katherine and Frieman, Joshua A. and Olinto, Angela V.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910034922},
  note = {Source identifier: 19910034922}
}