AbbasovaY. G., & KurbanovV. M. (2017). 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. Ukrains’kyi Matematychnyi Zhurnal, 69(6), 719-733. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/1731