On the modelling of fluid machines as acoustic N-port sourcesLavrentjev, JüriProceedings of International Conference INTER-NOISE 94, Japan, Yokohama, August 19941994 / p. 379-382 https://www.ingentaconnect.com/contentone/ince/incecp/1994/00001994/00000006/art00065;jsessionid=cpl3u5bbp88g.x-ic-live-02