The Sky at Einstein$1 (Bs Feets - Keel, William C.; SpringerLink (Online service) (New York, NY : Praxis Publishing Ltd., 2006)
Keywords: Physics; Astronomy; Astrophysics; Relativity (Physics); Physics; Astrophysics; Astronomy, Astrophysics and Cosmology; Astronomy; Relativity and Cosmology; Extraterrestrial Physics, Space Sciences