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2. STUDY OF HARD COATING FOR ALUMINUM ALLOYS
3. H.N. Hill and R.B. Mason, "Anodic Coatings on Aluminum—Their Brittleness," Metals and Alloys (1942), p. 972.
4. Fracture of oxide films on strained aluminium
5. W.C. Cochran, "Anodizing," Aluminum, Vol. III , Fabrication and Finishing , ASM, Metals Park, Ohio (1967), p. 641.