werner and smith 2001, werner & smith 1982, smith and warner 1979, schwartz and smith 2000, werner et al. 2009, rohner and britner 2002, smith and smith 2011, smith and osborn 2007, swan and smith 2001, walker and smith 2002, smith and osborn 2008, smith and vela 2001, skinner and piek 2001, sachs and warner 2001, sid smith and 2001, smith et al 2001, rogers and kesner 2003, hawkins and smith 2006, smith & osborn 2003, lochner and moretti 2004, wenger et al 2002
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