Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control Oct 1982, 7 (4) 149-156; DOI: 10.1136/rapm-00115550-198207040-00004
David G.Silverman, THERESA Z.O'connor, Robert F.Spencer, Luke M.Kitahata
Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control Nov 1993, 18 (6) 356-360; DOI: 10.1136/rapm-00115550-199318060-00006
Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control Jan 1983, 8 (1) 1-5; DOI: 10.1136/rapm-00115550-198308010-00001