Another ancient reference (K/T) is:
Tucker, W. 1977. The effect of a nearby supernova explosion on Cretaceous-
Tertiary environments. pp. 111-124 IN: Cretaceous-Tertiary Extinctions
and Possible Terrestrial and Extraterrestrial Causes.
Syllogeus, 12. National Mus. Nat. Sci., Canada
- Roy Plotnick