Balss (1924)†, Barnard (1950)†, Boone (1934)†, Crane (1975)†, El-Sayed et al. (2016)†, Lewinsohn (1977)†, Maccagno (1928), Naderloo et al. (2010)†, Nobili (1906), Rosenberg (2020), Serène (1973)†, Shih & Poupin (2020)†, Shih et al. (2022), Stella (1953)†, Vannini & Valmori (1981)†
Entries marked with † represent indirect references to location through citation.