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. 2013 Aug 4;3:18. doi: 10.1186/2045-9912-3-18

Figure 2.

Figure 2

A search of PubMed for articles titled helium shows an increased number of publications with an interest in helium within the last 10 years. A PubMed search was performed with helium contained in the text of the title and the search results were counted and graphed by year.