By Hiroyuki Noji, Ryohei Yasuda, Masasuke Yoshida, and Kazuhiko Kinosita Jr.. Nature 386, 299–302; published 20 March 1997. DOI 10.1038/386299a0.
Cited passages: publisher abstract and author information. The abstract describes fluorescent-filament observation of isolated F1 rotation; it does not establish the complete membrane-coupled synthesis assay.