Hage, J. Joris (April 2008), "Heraklas on Knots: Sixteen Surgical Nooses and Knots from the First Century A.D.", World Journal of Surgery, vol. 32, no. 4, pp. 648—55, doi:10.1007/s00268-007-9359-x, PMID18224483
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pubmed.ncbi.nlm.nih.gov
Hage, J. Joris (April 2008), "Heraklas on Knots: Sixteen Surgical Nooses and Knots from the First Century A.D.", World Journal of Surgery, vol. 32, no. 4, pp. 648—55, doi:10.1007/s00268-007-9359-x, PMID18224483