thallium

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Double halides of caesium, rubidium, sodium and lithium with thallium
J. H. Pratt

American Journal of Science May 1895, s3-49 (293) 397-404; DOI: https://doi.org/10.2475/ajs.s3-49.293.397
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On thallium triiodide and its relation to the alkali-metal triiodides
H. L. Wells and S. L. Penfield

American Journal of Science June 1894, s3-47 (282) 463-466; DOI: https://doi.org/10.2475/ajs.s3-47.282.463