Acoustic properties of indoor plants

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I tried to find some info on the acoustic properties of indoor plants.
I searched the following journals

J. of the Acoustical Society of America
J. of the Audio Engineering Society
Applied Acoustics
J. of Sound and Vibration
Acustica/acta acustica
J. of the Acoustical Society of Japan

and engineering databases

Compendex
Inspec

So far I found only three publications:

Sabine, =84 Collected papers on acoustics=93, Harvard University Press
1922

Siekman =93, Outdoor acoustical treatment: grass and trees=94, J. of the
Acoustical Society of America 1969, vol. 46, no. 4 (part 1), p.863

http://www.plants-in-buildings.com/acoustic.php

Are there any other journals that might be relevant? Any other
websites, books?

Klaus