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@Comment{refnotes,
  namespace = "cite:freeness"
}
 
@article{voiculescu1987multiplication,
  title={Multiplication of certain non-commuting random variables},
  author={Voiculescu, Dan},
  journal={Journal of Operator Theory},
  pages={223--235},
  year={1987},
  publisher={JSTOR}
}

@Comment{refnotes,

namespace = "cite:boolean"

}

@article{bozejko1989positive,

title={Positive-definite kernels, length functions on groups and a noncommutative von Neumann inequality},
author={Bo{\.z}ejko, Marek},
journal={Studia Mathematica},
volume={95},
pages={107--118},
year={1989},
publisher={Instytut Matematyczny Polskiej Akademii Nauk}

}