William Ramsay; Frederick Soddy. Experiments in Radioactivity, and the Production of Helium from Radium. Proceedings of the Royal Society of London. 1903 - 1904, roč. 72, s. 204–207. Dostupné online. DOI10.1098/rspl.1903.0040.
jstor.org
links.jstor.org
William Ramsay; Frederick Soddy. Experiments in Radioactivity, and the Production of Helium from Radium. Proceedings of the Royal Society of London. 1903 - 1904, roč. 72, s. 204–207. Dostupné online. DOI10.1098/rspl.1903.0040.
nobelprize.org
Frederick Soddy - Biography [online]. The Nobel Foundation [cit. 2012-02-03]. Dostupné online. (anglicky)