By Alonso R.   Horowitz C.   López GarcÍa A.   in Hyperfine Interactions

ISSN:0304-3843|136|3-8|541-547

Springer Publishing Company ‎(2001)‎

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By Fidalgo Prieto U.   López García A.   López Lagomasino G.   Sorokin V.   in Constructive Approximation

ISSN:0176-4276|32|2|255-306

Springer Publishing Company ‎(2010)‎

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