@book{Gutermann2021,
  author    = {Walter Gutermann},
  title     = {Die Ranunculaceae der Flora von Zentraleuropa: Ficaria},
  doi       = {10.21248/gups.61483},
  url       = {http://flora-deutschlands.de/files/Ranunculaceae-Ficaria.pdf},
  year      = {2021},
}