@article{GrimssonUlrichZetteretal.2021,
  author    = {Friðgeir Gr{\´i}msson and Silvia Ulrich and Reinhard Zetter and Thomas H{\"o}rnschemeyer and Michael S. Engel and Sonja Wedmann},
  title     = {How to extract and analyze pollen from internal organs and exoskeletons of fossil insects},
  journal   = {STAR Protocols},
  volume    = {2.2021},
  number    = {100923},
  pages     = {1 -- 19},
  doi       = {10.1016/j.xpro.2021.100923},
  year      = {2021},
}