1.
Einstein's General Theory of Relativity With Modern Applications in Cosmology
by Gron, Oyvind, Hervik, Sigbjorn
ISBN: 9780387691992
List Price: $134.00
2.
Einstein's Theory: A Rigorous Introduction for the Mathematically Untrained
by Oyvind Gron
ISBN: 9781489997326
List Price: $79.95