TY  - DATA
AU  - Jürgen Ehlers, Helmut Friedrich
TI  - Canonical Gravity: From Classical to Quantum
SN  - 9783540486657
PY  - 1994///
PB  - Springer Berlin Heidelberg
KW  - Physics and Astronomy
UR  - https://doi.org/10.1007/3540583394
ER  -