Szekeres, P.Blair, D.2007-06-022007-06-022000General Relativity and Gravitation, 2000, vol.32, iss.3, pp.369-3700001-77011572-9532http://hdl.handle.net/2440/32207The definitive version can be found at www.springerlink.comenSpecial issue: Australasian Conference on General Relativity and GravitationConference paper000100320410.1023/A:100192522945462307