thallium

[1981] The Letters of William Crookes to Charles Hanson Greville Williams 1861–2: The Detection and Isolation of Thallium ; Frank A. J. L James ; Ambix 28 (1981) p. 131 [lien]
[1984] Of 'Medals and Muddles' the Context of the Discovery of Thallium: William Crookes's Early Spectro-Chemical Work ; Frank A. J. L. James ; Notes and Records 39 (1984) p. 65 [lien]