1. 3He in Helium' and 'Helium and Hydrogen of Mass 3′;Alvarez;Physical Review,1939
2. Extraterrestrial cause for the Cretaceous-Tertiary Extinction;Alvarez;Science,1980
3. The limitations of mass spectrometrie radiocarbon dating using CN ions;Anbar,1978
4. Natural Radiocarbon from Cosmic Radiation;Anderson;Physical Review,1947
5. Radiocarbon dating with the Chalk River MP tandem accelerator;Andrews,1978