- Author: Olli Lehto
- Language: English
- Year: 1998
- Author: Olli Lehto (auth.)
- Language: German
- Year: 2008
- Author: Olli Lehto (auth.)
- Language: English
- Year: 1987
- Author: Olli Lehto, K I Virtanen
- Language: English
- Year: 1973
- Author: Olli Lehto (auth.)
- Language: English
- Year: 1998
- Author: Simion Stoilow, Cabiria Andreian Cazacu, Olli Lehto, Themistocles M Rassias (eds.)
- Language: English
- Year: 1998