Никел (Bulgarian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Никел" in Bulgarian language version.

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books.google.com

Scerri, Eric R. The periodic table: its story and its significance. Oxford University Press, 2007. ISBN 0-19-530573-6. p. 239 – 240. (на английски)

Carnes, Matthew et al. A Stable Tetraalkyl Complex of Nickel(IV) // Angewandte Chemie International Edition 48 (2). 2009. DOI:10.1002/anie.200804435. p. 3384. (на английски)}
Pfirrmann, Stefan et al. A Dinuclear Nickel(I) Dinitrogen Complex and its Reduction in Single-Electron Steps // Angewandte Chemie International Edition 48 (18). 2009. DOI:10.1002/anie.200805862. p. 3357. (на английски)