Karpeshina, Yu. E. Perturbation theory for a polyharmonic operator with nonsmooth periodic potential. (English. Russian original) Zbl 0724.47022 J. Sov. Math. 54, No. 3, 911-915 (1991); translation from Zap. Nauchn. Semin. Leningr. Otd. Mat. Inst. Steklova 169, 76-83 (1988). MSC: 47F05 47A10 47A55 PDFBibTeX XMLCite \textit{Yu. E. Karpeshina}, J. Sov. Math. 54, No. 3, 911--915 (1991; Zbl 0724.47022); translation from Zap. Nauchn. Semin. Leningr. Otd. Mat. Inst. Steklova 169, 76--83 (1988) Full Text: DOI
Karpeshina, Yu. E. A crack model in a plate. (English. Russian original) Zbl 0714.73064 J. Sov. Math. 45, No. 3, 1218-1229 (1989); translation from Probl. Mat. Anal. 10, 139-153 (1986). MSC: 74R99 74K20 47B38 47B25 PDFBibTeX XMLCite \textit{Yu. E. Karpeshina}, J. Sov. Math. 45, No. 3, 1218--1229 (1989; Zbl 0714.73064); translation from Probl. Mat. Anal. 10, 139--153 (1986) Full Text: DOI