TY  - BOOK
AU  - Penrose Roger; Rindler Wolfgang
TI  - Spinors and Space-time: Vol. 2. : Spinor and twistor methods in space-time geometry
SN  - 9780521347860
AV  - QC 20.7.PEN 
PY  - 1988///
CY  - New York
PB  - Cambridge Uni. Press
ER  -