1. A bloom of Tympanicysta Balme (green algae of zygnematalean affinities) at the Permian–Triassic boundary;Afonin;Geodiversitas,2001
2. Experimental evidence that an asteroid impact led to the extinction of many species 65 million years ago;Alvarez;Proc. Natl. Acad. Sci. U. S. A.,1983
3. T. rex and the Crater of Doom;Alvarez,1997
4. Extraterrestrial cause for the Cretaceous-Tertiary extinction;Alvarez;Science,1980
5. Current status of the impact theory for the terminal Cretaceous extinction;Alvarez,1982