Brass, P., Hellmich, M., Ladra, A., Ladra, J., & Wrzosek, A. (2016). Percutaneous techniques versus surgical techniques for tracheostomy. Cochrane Database Syst Rev.

Brass, Patrick, Martin Hellmich, Angelika Ladra, Jürgen Ladra, and Anna Wrzosek. "Percutaneous Techniques Versus Surgical Techniques for Tracheostomy." Cochrane Database Syst Rev 2016.

Brass, Patrick, et al. "Percutaneous Techniques Versus Surgical Techniques for Tracheostomy." Cochrane Database Syst Rev 2016.