TY  - BOOK
AU  - Levi-Civita,Tullio
AU  - Persico,Enrico
TI  - The absolute diffrential calculus
PY  - 1952///
CY  - New York
PB  - Hafner Pub.
KW  - Differential calculus
KW  - Relativity (Physics)
N1  - Includes index
ER  -