1. Sobolev spaces;Adams,1975
2. Expansion of matrix functions in terms of solutions of spectral problems (Russian);Aliev;Differentsial’nye Uravneniya,1966
3. A formula for the expansion of an arbitrary matrixfunction in terms of the solution of a spectral problem (Russian);Aliev,1967
4. On expandability of continuous functions from Sobolev classes into eigenfunctions of the Laplace operator (Russian);Alimov;Sibirsk. Mat. Zh,1978
5. On multiple basicity of eigenfunctions of a certain boundary value problem (Russian);Annaberdyev,1982