Bursey (1985), Croll & McClintock (2000), Michaels & Zieman (2013), Ohno et al. (2006)†, Peer et al. (2015)†, Rosenberg (2000)†, Rosenberg (2001)†, Rosenberg (2020)†, von Hagen (1980)
Entries marked with † represent indirect references to location through citation.