Allen H.Hord, P.Prithvi Raj, Janice M.Wang, Umeshraya T.Pai
Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control Jan 1991, 16 (1) 13-16; DOI: 10.1136/rapm-00115550-199116010-00003
Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control Jan 1985, 10 (1) 7-11; DOI: 10.1136/rapm-00115550-198510010-00002