1. “On the Quadratic Integrability of the Highest Derivatives of the Solution of the Dirichlet Problem in a Domain with Piecewise Smooth Boundary,”;Birman;Izv. Vysš. Ucben. Zaved. Matematika,1962
2. “Boundary Problems for Elliptic Equations with Conical or Angular Points,”;Kondrat'ev;Trans. Moscow Math. Soc.,1967
3. translated by Am. Math. Soc., 1968.
4. “Some Remarks on the Dirichlet Problem in Piecewise Smooth Domains,”;Hanna;Comm. Pure Appl. Math.,1967
5. Les methodes directes en théorie des equations elliptiques;Nečas,1967