- Author: Per F Dahl
- Language: English
- Author: Per-Johan Dahl Caroline Dahl (auth.)
- Language: English
- Year: 2012
- Author: Per F Dahl
- Language: English
- Year: 1999
- Author: Per F Dahl
- Language: English
- Year: 2002
- Author: Per F Dahl
- Language: English
- Year: 2002