1. Void Mortar Joints: Bane of Brick Masonry
2. M. Mehlmann and B. Oppermann , Properties of Factory Made Masonry Mortars , Proc. 9th Int. Brick /Block Masonry Conference , Berlin ( 1991 ) .
3. J. Noland , R. H. Atkinson and J. Baur , An Investigation into Methods of Non-Destructive Evaluation of Masonry Structures , Proc. 7th Int. Brick / Block Masonry Conference , Melbourne ( 1985 ).
4. M. Berra , L. Binda , L. Anti and A. Fatticcioni , Non-Destructive Evaluation of the Efficiency of Masonry Strengthening by Grouting Techniques , Proc. 9th Int. , Brick/ Block Masonry Conference . Berlin ( 1991 ) .