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Double Bass Anyone know much about subharmonics?

I came across this interesting study about bass timbre:

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On page 53 there was a large section devoted to subharmonics. Apparently, these are the direct opposite of harmonics, i.e. notes that sound lower than the fundamental. The way to achieve these subharmonics(according to the report) is to find a harmonic node with the bow and bowing with excessive pressure on the node, and with trail and error, you can find the right location and pressure required to 'catch' onto the subharmonic.
Now I'm sure it is possible to gain control over this method as there is mention of a violinist named Mari Kimura who has mastered the technique enough to play notes well within the bass clef.
what I want to know is there anyone who knows about or has had experience with subharmonics on a bass?