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Aktive Geräuschminderung bei Radialventilatoren durch Gegenschallquellen in der Gehäusezunge = Réduction active du bruit de ventilateurs radiaux par des sources sonores en opposition dans l'angle rentrant de la volute = Active noise control for centrifugal fans by means of external sources in the cutoff of the casingNEISE, W; KOOPMANN, G. H.VDI-Berichte. 1986, Num 594, pp 719-735, issn 0083-5560Article

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Noise reduction for air conditioning unitsTHEODORO, E. B; GERGES, S. N. Y.Institut international du froid, commissions B1, B2, E1 & E2. Réunion. 1986, pp 251-256Conference Paper