- Author: Ulrik Wagner, Rasmus K. Storm, Klaus Nielsen
- Language: English
- Year: 2017
- Author: Klaus Nielsen
- Language: English
- Year: 2021
- Author: Klaus Nielsen J. Robert Duncan
- Language: English
- Year: 1990
- Author: Klaus Nielsen
- Language: English
- Year: 2016
- Author: Stavros Ioannides Klaus Nielsen
- Language: English
- Year: 2007