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1994IAUS..159..361V - 159th Symposium of the IAU, held in Geneva, Switzerland, Aug.30-Sep.3, 1993. Ed. T.J.-L. Courvoisier and A. Blecha. Multi-wavelength continuum emission of AGN., 159, 361-362 (1994)
Spectra of distant quasars and verification of possible variation of fundamental constants over cosmological time-scales.
VARSHALOVICH D.A. and POTEKHIN A.Y.
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