Chertoprud et al. (2012)†, Naderloo et al. (2010)†, Ng et al. (2017), Ng et al. (2001), Rosenberg (2019)†, Shih et al. (2010)†, Shih et al. (2016), Tanaka et al. (2004)†
Entries marked with † represent indirect references to location through citation.