Hwang et al. (2015), Kim et al. (2005), Kim & Kim (1995), Ko & Kim (1989), Naderloo et al. (2010)†, Ng et al. (2017)†, Rho et al. (2005), Rosenberg (2020), Shih et al. (2016), Shih & Poupin (2020), Spivak & Cuesta (2009)†, Tanaka et al. (2004)†
Entries marked with † represent indirect references to location through citation.