TY  - BOOK
AU  - Newton, Isaac.
TI  - Mathematical priciples of natural philosophy and his system of the world : : Volume two: The system of the world
PY  - 1962///
CY  - Berkeley : 
PB  - University of California Press, 
KW  - MECANICA CLASICA
KW  - LEY DE GRAVITACION UNIVERSAL
KW  - ORBITA DE LOS PLANETAS
ER  -