Block D.L. Shrouds of the night : masks of the Milky Way and our awesome new view of Galaxies / D. L. Block, K. C. Freeman, 2009 r=on-line. - Текст : электронный.
Galaxies and their masks : A Conference in honour of K.C. Freeman, FRS / ed. D. L. Block, 2010 r=on-line. - Текст : электронный.