[1]
AbbasovaY. G. and KurbanovV. M., “Convergence of the spectral decomposition of a function from the class $W_{p,m}^1 (G),\; p > 1$, in the vector eigenfunctions of a differential operator of the third order”, Ukr. Mat. Zhurn., vol. 69, no. 6, pp. 719-733, Jun. 2017.