Mark Nicholson (Jan 2004). Journal of the Operational Research Society. 55 (1): 94–95. JSTOR 4101834.{{cite journal}}: CS1 maint: untitled periodical (link) /wiki/JSTOR_(identifier) ↩
David Olwell (Feb 2001). Technometrics. 43 (1): 104–105. JSTOR 1270871.{{cite journal}}: CS1 maint: untitled periodical (link) /wiki/JSTOR_(identifier) ↩