- Author: Prem Puri Michael E. Höllwarth
- Language: English
- Year: 2023
- Author: Prem Puri Michael E. Höllwarth
- Language: English
- Year: 2018
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- Language: English
- Year: 2019
- Author: Prem Puri Michael E. Höllwarth
- Language: English
- Year: 2005