Шаблон:Greenwood&Earnshaw2nd
Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (II изд.). Oxford: Butterworth-Heinemann. ISBN 0080379419.
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Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (II изд.). Oxford: Butterworth-Heinemann. ISBN 0080379419.