TY  - RPRT
TI  - Extraterrestrial cause for the Cretaceous-Tertiary extinction
AU  - Alvarez, L. W.
AU  - Alvarez, W.
AU  - Asaro, F.
AU  - Michel, H. V.
PY  - 1980
UR  - https://ntrs.nasa.gov/citations/19800051929
ID  - 19800051929
ER  -