Permissible deviations in the case of installations in buildings. Dimensional deviations and tolerances of brickwork / G. Heinicke. Dimnesional deviations in the case of precast reinforced concrete units ; DIN 18201 draft November 1958 ; Prefabrication in building tolerances / K.H. Krell
C. Hildebrand
Bok Engelsk 1964