CAUSES OF POOR ADHESION: BOUNDARY LAYERS
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Supplemental Notes:
- Vol 59, No 9, PP 40-44, 2 FIG, 1 TAB, 14 REF
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Authors:
- Bikerman, J J
- Publication Date: 1967-9
Media Info
Subject/Index Terms
- TRT Terms: Adhesion; Adhesives; Air; Boundary layer; Failure; Rheology
- Subject Areas: Geotechnology; Highways; Materials;
Filing Info
- Accession Number: 00216740
- Record Type: Publication
- Files: TRIS
- Created Date: Feb 24 1994 12:00AM