On linear ellipitical second order differential equations.

[1] BERNSTEIN BS, 1910, MATH ANN, V69, P95

[2] GIRAUD G, 1932, B SC MATH, V56, P1

[3] GREEN, 1930, J MATH, P1

[4] Korn A., 1914, SCHWARZ FESTSCHRIFT, P215

[5] KORN A, 1914, SCHWARZ FESTSCHRIFT, P25

[6] Levi E. E., 1907, REND CIRC MAT PALERM, V24, P275

[7] Riesz F, 1918, ACTA MATH-DJURSHOLM, V41, P71

[8] On the linear elliptical second order differential equation with three independent variables [J]. MATHEMATISCHE ZEITSCHRIFT, 1924, 21 : 286 - 311

[9] 1931, MATH Z, V33, P602

[10] 1933, B SOC MATH JUN

[1] BERNSTEIN BS, 1910, MATH ANN, V69, P95

[2] GIRAUD G, 1932, B SC MATH, V56, P1

[3] GREEN, 1930, J MATH, P1

[4] Korn A., 1914, SCHWARZ FESTSCHRIFT, P215

[5] KORN A, 1914, SCHWARZ FESTSCHRIFT, P25

[6] Levi E. E., 1907, REND CIRC MAT PALERM, V24, P275

[7] Riesz F, 1918, ACTA MATH-DJURSHOLM, V41, P71

[8] On the linear elliptical second order differential equation with three independent variables [J]. MATHEMATISCHE ZEITSCHRIFT, 1924, 21 : 286 - 311

[9] 1931, MATH Z, V33, P602

[10] 1933, B SOC MATH JUN