1. 1. AGMON S., DOUGLIS A. and NIRENBERG L., Estimates Near the Boundary for Solutions of Elliptic Partial Differential Equations Satisfying General Boundary Conditions. L, Comm. Pure Appl. Math., vol. 12, 1959, pp. 623-727.1253070093.10401
2. 2. BEREZANSKH Yu. M. and ROITBERG Ya. A., A Theorem on Homeomorphims and the Green's Function for General Elliptic Boundary Problems (in Russian), Ukrain. Math. Z., vol. 19, 1967, pp. 3-32 (English translation, Ukrain. Math. J., vol. 19, 1967, pp. 509-530).2187390206.11302
3. 3. BERS L., JOHN F. and SCHECHTER M., Partial Differential Equations, Interscience, New York, 1964.1630430126.00207
4. 4. BRAMBLE J. H. and HILBERT S., Bounds for a Class of Linear Functionals with Applications to Hermite Interpolation, Numer. Math., vol. 16, 1971, pp. 362-369.1320412905240214.41405
5. 5. CIARLET P. G., Numerical Analysis of the Finite Element Method, Séminaire de Mathématiques supérieures, Presse de l'Université de Montréal, 1976.4950100363.65083