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de Grassberger, Martin (). „Suicidal asphyxiation with helium: Report of three cases Suizid mit Helium Gas: Bericht über drei Fälle”. Wiener Klinische Wochenschrift (în German & English). 119 (9–10): 323–325. doi:10.1007/s00508-007-0785-4. PMID17571238.Mentenanță CS1: Limbă nerecunoscută (link)
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worldcat.org
Ramsay, William (). „On a Gas Showing the Spectrum of Helium, the Reputed Cause of D3 , One of the Lines in the Coronal Spectrum. Preliminary Note”. Proceedings of the Royal Society of London. 58: 65–67. doi:10.1098/rspl.1895.0006. ISSN0370-1662.