Levander H., and Anker C. “A Permanent Subcutaneous Catheter for Drawing Blood Samples and for Intravenous Fluid Therapy in a Diabetic Woman With Recurrent Ketoacidosis”. Upsala Journal of Medical Sciences, vol. 91, no. 3, Sept. 1986, pp. 323-4, doi:10.3109/03009738609178673.