Ser y universo
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- Author: Cristóbal Holzapfel
- Language: Spanish
- Year: 1989
- Author: Paola Mattarelli, Bruno Biavati, Wilhelm H. Holzapfel, Brian JB Wood
- Language: English
- Year: 2017
- Author: Helmut Holzapfel
- Language: English
- Year: 2015
- Author: R.-P. Holzapfel
- Language: English
- Year: 1986
- Author: Gerhard A. Holzapfel
- Language: English
- Year: 2001
- Author: Gerhard A. Holzapfel
- Language: English
- Year: 2001
- Author: Helmut Holzapfel (auth.)
- Language: German
- Year: 2016
