- Bulgaria
- Zicsi and Csuzdi, 1986b; Szederjesi, 2012
- Denmark
- Blakemore, 2007
- Finland
- Blakemore, 2007
- France
- Bouche, 1972
- Greece
- Szederjesi and Csuzdi, 2012
- Iceland
- Stop-Bowitz, 1969; Hansen et al., 2006; Blakemore, 2007b
- Kazakhstan
- Abukenova, 2010
- Latvia
- Ventins, 2011
- Madeira
- Talavera, 1996
- Norway
- Blakemore, 2007
- Romania
- V.V.Pop, 2012.
- Sweden
- Blakemore, 2007
- Ukraine
- Krivolutsky and Pokarzhevsky, 1992; Krivolutzky et al., 1992.
- United Kingdom
- Scotland: Carpenter, 2011
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Data are not exhaustive. The database is permanently a work in progress.