It was posted to Daz3D Forums but the original links are unavailable. Anyone..?
There's just a Google Sites link which requires permissions.
https://sites.google.com/site/vibrationphysics0606/
Which includes:
Breast Physics for G8F v1.01
Breast Physics for G3F v1.02
Breast Physics for G2F v1.02
Breast Physics for Genesis v0.65
https://www.daz3d.com/forums/discussion/20208/breast-bounce-script-for-daz-studio-4-5/p9
https://www.daz3d.com/forums/discussion/20208/breast-bounce-script-for-daz-studio-4-5