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- [3] SINGULAR FINITE-ELEMENTS COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE A, 1976, 283 (15): : 1029 - 1032
- [5] SINGULAR ISOPARAMETRIC FINITE-ELEMENTS JOURNAL OF THE INSTITUTE OF MATHEMATICS AND ITS APPLICATIONS, 1977, 20 (01): : 133 - 141