- Author: Tom Witosky, Marc Hansen, Michael Gartner
- Language: English
- Year: 2015
- Author: Hansen Michael R., Rischel Hans
- Language: English
- Year: 1999
- Author: Hansen Michael R., Rischel Hans
- Language: English
- Year: 2013
- Author: Hansen Michael R. & Rischel Hans
- Language: English
- Year: 2013
- Author: Holger Bernt Hansen Michael Twaddle
- Language: English
- Year: 1991
Mat A htx
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- Author: Allan Bohnstedt Bernt Hansen Michael Jensen Klaus Marthinus
- Language: Danish
- Year: 2009
- Author: Hansen Michael R., Rischel Hans
- Language: English
- Year: 1999
- Author: Holger Bernt Hansen Michael Twaddle
- Language: English
- Year: 1988
- Author: Holger Bernt Hansen Michael Twaddle
- Language: English
- Year: 1995