Al-Aidaroos (2013)†, Barea-Azcón et al. (2008)†, Benetti et al. (2013)†, Drake et al. (1998), González-Gordillo et al. (2003), González-Gordillo & Rodríguez (2003), González-Ortiz et al. (2014), Jamieson & Tudge (2000)†, Medina (1992), Medina & Rodríguez (1992), Medina & Rodríguez (1992), Mourente et al. (1994), Pinoni et al. (2018), Rodríguez et al. (1997), Rodríguez-Tovar et al. (2014)†, Rosenberg (2020)†, Shih et al. (2010)†, Spivak & Cuesta (2009), Talapatra et al. (2014)†
Entries marked with † represent indirect references to location through citation.