- Author: Satell Greg
- Language: English
- Year: 2017
- Author: Raynor Michael E
- Language: English
- Year: 2011
- Author: Christensen Clayton M
- Language: English
- Year: 1996
- Author: Christensen Clayton M
- Language: English
- Year: 2016
- Author: Christensen Clayton
- Language: English
- Year: 2013
- Author: Jendricke Bernhard, Kotter John, Rathgeber Holger
- Language: German
- Year: 2017
- Author: Granholm Göran, Grösser Stefan N., Reyes-Lecuona Arcadio
- Language: English
- Year: 2017