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2. Elliptic Problems in Nonsmooth Domains;Grisvard,1985
3. Singularities in Boundary Value Problems;Grisvard,1992
4. Boundary value problems for elliptic equations in domains with conical or angular points;Kondrat’ev;Trans. Mosc. Math. Soc.,1967
5. Finite Elemente;Braess,1997