Separation of Complex Spectra into Individual Bands by the Generalized Alentsev Method -- Application of the Generalized Alentsev Method in Analysis of the Blue Luminescence Spectrum of ZnS -- Preparation of Zinc Sulfide Crystals and Nature of Blue Luminescence Centers in Self-Activated ZnS -- Use of Crystal Phosphors in Detection of Electromagnetic Radiations -- Investigation of Gallium Arsenide Lasers Pumped by Electron-Beam Bombardment -- Investigations of Some Four-Field Parametric Interactions -- A Contribution to the Theory of Excitons in Molecular Crystals -- Quenching of the Photoluminescence by Electron Irradiation and Energy Transfer in Molecular Crystals.