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Smith ER, Butler WE, Barker FG 2nd.Smith ER, et al. Among authors: butler we.J Neurosurg. 2006 Sep;105(3 Suppl):169-76. doi: 10.3171/ped.2006.105.3.169.J Neurosurg. 2006.PMID: 16970228
Smith ER, Butler WE, Ogilvy CS.Smith ER, et al. Among authors: butler we.Curr Opin Neurol. 2002 Apr;15(2):165-71. doi: 10.1097/00019052-200204000-00007.Curr Opin Neurol. 2002.PMID: 11923630Review.
Smith ER, Butler WE, Barker FG 2nd.Smith ER, et al. Among authors: butler we.J Neurosurg. 2004 Feb;100(2 Suppl Pediatrics):90-7. doi: 10.3171/ped.2004.100.2.0090.J Neurosurg. 2004.PMID: 14758935
Smith ER, Butler WE, Barker FG 2nd.Smith ER, et al. Among authors: butler we.Neurosurgery. 2004 Mar;54(3):553-63; discussion 563-5. doi: 10.1227/01.neu.0000108421.69822.67.Neurosurgery. 2004.PMID: 15028128