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3. The accuracy of mechanisms controlled by differential equations;Byhovskiĭ;Izvestiya Akad. Nauk SSSR. Otd. Tehn. Nauk,1947
4. The accuracy of electric networks intended for the solution of Laplace's equation;Byhovskiĭ;Izvestiya Akad. Nauk SSSR. Otd. Tehn. Nauk,1950