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2. Journal of Applied Mechanics;Roberts;The eigenvalue problem for twodimensional regions with irregular boundaries,1967
3. Archives for Rational Mechanics and Analysis;Segel;Application of conformal mapping to boundary perturbation problems for the membrane equation,1961
4. Air Force Institute of Technology Thesis;Nesseth;Natural frequencies of membranes and plates with slightly non-circular boundaries,1971
5. Perturbation Methods;Nayfeh,1973