Every reference with a DOI in the deposited reference list resolved to a known
work in Crossref or DataCite at the dated check, and none carried a retraction,
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The 7 references without a DOI — listed, not checked
no DOI — not checkedS.P. Timoshenko and J.N. Goodier, Theory of Elasticity, McGraw-Hill, NY (1982).
no DOI — not checkedR.E. Perterson, Stress Concentration Factors, John Wiley, NY (1974).
no DOI — not checkedI.N. Sneddon, Fourier Transforms, McGraw-Hill, NY (1951).
no DOI — not checkedL.J. Gibson and M.F. Ashby, Cellular Solids, Pergamon, Oxford, (1988).
no DOI — not checkedD.J. Green, Fabrication and Mechanical Properties of Lightweight Ceramics Produced by Sintering of Hollow Spheres. Final Report on AFOSR contract No. F49620-83-C0078 (1984).
no DOI — not checkedASTM, Annual Book of ASTM Standards, Designation: E813-87 and E1152-87, Philadelphia, PA (1986).
no DOI — not checkedH.I. Ewalds and R.J.H. Wanhill, in Fracture Mechanics 1986, Edward Arnold, NY (1986) 33.
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