@article{CRMATH_2002__334_8_649_0,
     author = {Youri V. Egorov and Vladimir A. Kondratiev and Bert-Wolfgang Schulze},
     title = {On completeness of root functions of elliptic boundary problems in a domain with conical points on the boundary},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {649--654},
     publisher = {Elsevier},
     volume = {334},
     number = {8},
     year = {2002},
     doi = {10.1016/S1631-073X(02)02320-8},
     language = {en},
}