<https://pubs.aip.org/aapt/pte/article/54/6/330/277955/Balloon-and-Button-Spectroscopy-A-Hands-On>
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<https://pubs.aip.org/aapt/pte/article-abstract/54/6/330/277955/Balloon-and-Button-Spectroscopy-A-Hands-On?redirectedFrom=fulltext>