- Author: De Giorgi Ennio, De Giorgi Ennio, Colombini Ferruccio
- Language: English
- Year: 1989
- Author: De Giorgi Ennio, De Giorgi Ennio, Colombini Ferruccio
- Language: English
- Year: 1989
- Author: Sasun Yakubov
- Language: English
- Year: 1994
- Author: Lions Jacques Louis, Magenes Enrico, Baiocchi C.
- Language: English
- Year: 1993