Al-Aidaroos (2013)†, Costa et al. (2001), Domínguez Alonso (2008)†, Ghory & Siddiqui (2006)†, Paula (1985), Paula (1989), Rodríguez et al. (1997)†, Rodríguez-Tovar et al. (2014)†, Rosenberg (2000), Rosenberg (2001), Rosenberg (2002)†, Shih et al. (2016)†, Spivak & Cuesta (2009)†
Entries marked with † represent indirect references to location through citation.