Still's-like innocent murmur can be produced by increasing aortic velocity to a threshold value.

@article{Klewer1991StillslikeIM,
  title={Still's-like innocent murmur can be produced by increasing aortic velocity to a threshold value.},
  author={Scott E. Klewer and Richard L. Donnerstein and Stanley J. Goldberg},
  journal={The American journal of cardiology},
  year={1991},
  volume={68 8},
  pages={810-2}
}