Apel & Türkay (1999), El-Sayed et al. (2016)†, Hogarth & Beech (2002), Hornby (1997), Ismail & Ahmed (1993), Naderloo (2017)†, Naderloo et al. (2015)†, Naderloo et al. (2016)†, Naderloo & Türkay (2012)†, Naderloo et al. (2010)†, Naser et al. (2010)†, Saher et al. (2014)†, Shih et al. (2022)†
Entries marked with † represent indirect references to location through citation.