Wolfson, Paul R. (2008). "George Boole and the origins of invariant theory". Historia Mathematica. 35 (1). Elsevier BV: 37–46. doi:10.1016/j.hm.2007.06.004. ISSN0315-0860.
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Wolfson, Paul R. (2008). "George Boole and the origins of invariant theory". Historia Mathematica. 35 (1). Elsevier BV: 37–46. doi:10.1016/j.hm.2007.06.004. ISSN0315-0860.