- Author: Professor Dr. Martin J. Beckmann Professor Dr. Tönu Puu (auth.)
- Language: English
- Year: 1990
- Author: Tönu Puu (auth.)
- Language: English
- Year: 2015
- Author: Professor Dr. Tönu Puu (auth.)
- Language: English
- Year: 2003
- Author: Professor Dr. Tönu Puu (auth.)
- Language: English
- Year: 2003
- Author: Professor Dr. Tönu Puu (auth.)
- Language: English
- Year: 1997
- Author: Professor Dr. Tönu Puu (auth.)
- Language: English
- Year: 1991
- Author: Professor Dr. Tönu Puu (auth.)
- Language: English
- Year: 1993
- Author: Tönu Puu (auth.) Professor Dr. Tönu Puu Dr. Iryna Sushko (eds.)
- Language: English
- Year: 2006