- Author: William Rees Sears
- Language: English
- Year: 2015
- Author: Gerhard Müller-Schwefe
- Language: German
- Year: 1978
- Author: Mala Malla
- Language: English
- Year: 2011
- Author: Maxim G. Ryadnov
- Language: English
- Year: 2021
- Author: Schmidt Gunther, Winter Michael
- Language: English
- Year: 2018
- Author: Schmidt Gunther, Winter Michael
- Language: English
- Year: 2018