couldn’t use this source:
Odd tale of headless Norse men: Slaves buried with masters
http://www.usatoday.com/story/news/nation/2013/09/19/viking-slaves-masters/2836903/
also linked here:
http://viking-archaeology-blog.blogspot.com/
found this one, which had the links to ScienceDirect:
Slaves as grave gifts for the Vikings
http://bonesdontlie.wordpress.com/2013/09/17/slaves-as-grave-gifts-for-the-vikings/
The Slavs owned slaves?
Who’d a thunk...
Sometimes the world really is just bass-ackwards!
This is actually just confirming eyewitness accounts, can’t remember his name but an Arab diplomat witnessed a Viking funeral back in the day and saw slaves drugged and sacrificed.