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.