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1. A novel Lindqvist type polyoxoniobate coordinated to four copper complex moieties: {Nb6O19[Cu(2,2′-bipy)]2[Cu(2,2′-bipy)2]2} · 19H2O
Jing-Ping Wanga, Hong-Yu Niua and Jing-Yang Niu
Inorganic Chemistry Communications
Volume 11, Issue 1, January 2008, Pages 63-65

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http://dx.doi.org/10.1016/j.inoche.2007.10.015

2. Surface complexation of [Nb6O19]8− with NiII: solvothermal synthesis and X-ray structural characterization of two novel heterometallic Ni---Nb-polyoxometalates
Kaspar Hegetschweiler, Robert C. Finnb, Randy S. Rarig, Jr. b, Jürgen Sandera, Stefan Steinhausera, Michael Wörlec and Jon Zubieta
Inorganica Chimica Acta
Volume 337, 26 September 2002, Pages 39-47

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http://dx.doi.org/10.1016/S0020-1693(02)00991-X

3. Synthesis, structure, and molecular modeling of a titanoniobate isopolyanion
Nyman, May; Criscenti, Louise J.; Bonhomme, François; Rodriguez, Mark A.; Cygan, Randall T.
Journal of Solid State Chemistry, Volume 176, Issue 1, p. 111-119.

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http://dx.doi.org/10.1016/S0022-4596%2803%2900354-2

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