00421nam a2200181Ia 4500003000400000005001700004008004100021020001800062040000700080041000800087082002200095100002300117245002700140260002900167300001700196365001400213650001200227OSt20230428122514.0210423s2013    xx            000 0 und d  a9788126153558  cAL  aeng  a530.11223b SINA  aSINGH (Arun Kumar)  aConcepts in relativity  bAnmol Publicationsc2013  aviii,200bPB  b1200cINR  aPhysics