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Hall R. Dynamic stiffness of wall ties used in masonry cavity walls : measurement procedure / R.Hall,C.Hopkins, 2001. - 6 p. - Текст : непосредственный.
Burgess C. The first soviet cosmonaut team : their lives, legacy, and historical impact / C. Burgess, R. Hall, 2009 r=on-line. - Текст : электронный.