Petrov, A Z <br/><br/>
Einstein spaces 

 - Oxford:   Pergamon Press,   1969 
 - xiii, 411p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Spaces
<br/><br/><label>Subjects--Index Terms: </label>Gravitational fields 
<br/><br/><label>Universal Decimal Class. No.: </label>530.12:531.51  / K9