Davis, Craig R. 1998 'Cultural Assimilation in Njáls saga', Oral
Tradition, 13/2, pp. 435-455 [
http://journal.oraltradition.org/files/articles/13ii/9_davis.pdf ].

An interesting read on the structure and ideology of Njála, including
discussion of Gunnar's motive in breaking the terms of his outlawry
and Njal's motives when it comes to the burning. Also good revision. I
suppose I should give a SPOILER WARNING...