1
The n-body problem in general relativity.
Book
Other Personal Name(s): ...Levi-Civita, Tullio....
2
The n-Body Problem in General Relativity [E-Book] /
Other Personal Name(s): ...Levi-Civita, Tullio...

Full text 
3
The absolute differential calculus : (calculus of tensors) /
Book
Other Personal Name(s): ...Levi-Civita, Tullio....