TransliterationDanilov-Danilyan V.I., Nekipelov A.D. (redkol.) i dr. Novaya Rossiyskaya entsiklopediya: Tom XVII (1). Ultrazvuk-Franko-Prusskaya
In EnglishDanilov-Danilyan V.I., Nekipelov A.D. (rare) et al. New Russian Encyclopedia: Volume XVII (1). Ultrasound-Franco-Prussian In Russian
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