Barnwell & Szelistowski (1985), Beinlich & von Hagen (2006), Crane (1941), Crane (1947), Crane (1975), Garth (1948), Hendrickx (1995), Landstorfer & Schubart (2010), Lemaitre & Alvarez León (1992), Ng et al. (2008), Rosenberg (2000), Rosenberg (2001), Rosenberg (2002), Shih et al. (2016), von Hagen (1987)