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1990MNRAS.243..192N - Mon. Not. R. Astron. Soc., 243, 192-198 (1990)
Why are the BL Lac objects AO 0235+164 and PKS 0537-441 not multiply imaged by gravitational lensing ?
NARAYAN R. and SCHNEIDER P.
Journal keyword(s):
Simbad objects: 5
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