Bakke, K. http://orcid.org/0000-0002-9038-863X
Article History
Received: 8 November 2018
Accepted: 2 January 2019
First Online: 22 February 2019
Change Date: 13 September 2019
Change Type: Erratum
Change Details: After publication, the author noticed that some equations needed amendments. Here follows their correct version.