http://pure.au.dk/portal/en/publications/verb-movement-variation-in-germanic-and-optimality-theory%28764d9c0b-67f8-4c16-b672-3760518b0f70%29.html (Any fulltext)
http://www.hum.au.dk/engelsk/engsv/papers/viknhabi.pdf (Any fulltext)
Vikner, S. (2001). Verb movement variation in Germanic and optimality theory. Habilitation Thesis, Univ., Tübingen.