Anert V.,  Shteffen F. Tekhnika zvukousileniya. Teoriya i praktika./Anert W.,  Steffen F. Sound amplification technique. Theory and practice. In Russian - landofmagazines.com

TransliterationAnert V., Shteffen F. Tekhnika zvukousileniya. Teoriya i praktika.

In EnglishAnert W., Steffen F. Sound amplification technique. Theory and practice. In Russian

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