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Gerald R. Popelka B. C. J. M. R. R. F. A. N. P., .Hearing Aids. : Springer.
Gerald R. Popelka Brian C J Moore Richard R Fay Arthur N Popper, .Hearing Aids. : Springer.
Gerald R. Popelka Brian C J Moore Richard R Fay Arthur N Popper, .: Springer. .
