|i2=
}}
== References ==
{{Ref|Arwidsson 1983}}
{{Ref|Arwidsson 1986}}
{{Ref|WOV 2003}}
{{Ref|Graham-Campbell 1980}}
{{Ref|Petersen 1940}}
{{Ref|Petersen 1951}}
{{Ref|Roesdahl & Wilson 1992}}
{{Ref|Rygh 1885}}
{{Ref|Schietzel 2014}}
http://www.unimus.no/samsok/index.php
<HarvardReferences />