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JPRS publications contain information primarily from foreign newspapers, periodicals and books, but also from news agency transmissions and broadcasts Materials from foreign-language sources are translated; those from English language sources are transcribed or reprinted, with the original phrasing and other characteristics retained. This document contains articles about physics and mathematics in the USSR. Topics include acoustics, laser glasses, semiconductors, crystals, gas dynamics, fluid dynamics, high-temperature physics, molecular physics, nuclear physics, optics and spectroscopy, plasma physics, thermodynamics, superconductivity, technical physics, logic and game theory, numerical analysis, control theory, differential equations, and operations research.