Funding for this research was provided by:
Knowledge Foundation (KK-stiftelsen), Sweden (20140032)
Text and Data Mining valid from 2019-03-29
Received: 22 October 2018
Accepted: 19 March 2019
First Online: 29 March 2019
Compliance with ethical standards
: Johan Hall is an employee at the company Arkiv Digital AB (Sweden) which is mentioned in the article. The rest of authors declare that they have no conflict of interest.