Russell, Bertrand.
ABC of Relativity / - Third Rev Ed. / - London WC1A 1LU : George Allen & Unwin Ltd.. - p.160 :
0-04-521002-0
Relativity
CN / L7
ABC of Relativity / - Third Rev Ed. / - London WC1A 1LU : George Allen & Unwin Ltd.. - p.160 :
0-04-521002-0
Relativity
CN / L7