Contents: The Lagrangian Function of a High-Intensity Electromagnetic Field; The Shift of Electron Mass in a High-Intensity Field; Three-Photon Interaction in a High-Intensity Field; Radiation Effects and their Enhancement in a High-Intensity Electromagnetic Field; An S-Matrix of Quantum Electrodynamics with a Pair-Production External Field; A Particle in a Static Electrical Field and a Planar Electromagnetic Wave Propagating Along the Field; The Formation of a e+e-Pair from a Fast Muon/Atom Collision; The Influence of a Laser Field on the Beta Decay of Nucleii and Other Processes Occurring in the Absence of a Field.