@inbook{127,
  author = {G. Keller},
  title = {The K/T mass extinction in planktic foraminifera biotic constraints for catastrophe theories},
  year = {1996},
  journal = {The Cretaceous-Tertiary mass extinction: Biotic and environmental events},
  pages = {63-100},
  publisher = {Norton Press},
  address = {New York},
  language = {eng},
}