Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control Apr 1981, 6 (2) 79-81; DOI: 10.1136/rapm-00002370-198104000-00007
Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control May 1996, 21 (3) 202-208; DOI: 10.1136/rapm-00115550-199621030-00005