1. On the analytic continuation of the solution of the Schrödinger equation in the spectral parameter and the behavior of the solution to the nonstationary problem as t → ∞;Ramm;Uspeh. Mat. Nauk,1964
2. Analytical continuation of the resolvent kernel of the Schrödinger operator in the spectral parameter and limit amplitude principle in some infinite domains;Ramm;Dokl. Acad. Sci. Azerb. SSR,1965
3. Domain where the resonances are absent in the three-dimensional scattering problem;Ramm;Doklady,1966
4. Some theorems on analytic continuation of the Schrödinger operator resolvent kernel in the spectral parameter;Ramm;Izv. Akad. Nauk. Armjan. SSR Sec. Mat.,1968