@article {Lawhorn:March 1997:0952-8180:103,
	author = "Lawhorn C.D.",
	author = "Stoner J.M.",
	author = "Schmitz M.L.",
	author = "Brown R.E.",
	author = "Stewart F.W.",
	author = "Volpe P.",
	author = "Shirey R.",
	title = "Caudal Epidural Butorphanol Plus Bupivacaine versus Bupivacaine in Pediatric Outpatient Genitourinary Procedures",
	journal = "Journal of Clinical Anesthesia",
	volume = "9",
	year = "March 1997",
	abstract = "",
	pages = "103-108(6)",
	url = "http://www.ingentaconnect.com/content/els/09528180/1997/00000009/00000002/art00231"
	doi = "doi:10.1016/S0952-8180(97)00231-6"
}