- Author: Kalkbrener.
- Language: English
- Year: 1993
- Author: Kozen Landau Zippel.
- Language: English
- Year: 1996
- Author: Fix et al.
- Language: English
- Year: 1996
- Author: Guisti Lecerf Salvy.
- Language: English
- Year: 2000
- Author: De Jager Van Asch.
- Language: English