We present a complete intersection Calabi-Yau manifold Y that has Euler number -72 and which admits free actions by two groups of automorphisms of order 12. These are the cyclic group Z_12 and the non ...

He has developed (together with P Fré and L Castellani) a new geometrical and group theoretical approach to the construction of any Supergravity theory, usually known as group manifold approach or ...