Blume, L. E.; Zame, W. R. «The algebraic geometry of perfect and sequential equilibrium». Econometrica, 62, 4, 1994, pàg. 783–794. DOI: 10.2307/2951732. JSTOR: 2951732.
Blume, L. E.; Zame, W. R. «The algebraic geometry of perfect and sequential equilibrium». Econometrica, 62, 4, 1994, pàg. 783–794. DOI: 10.2307/2951732. JSTOR: 2951732.
; Robertson, E. F.«Omar Khayyam». School of Mathematics and Statistics, University of St Andrews. Arxivat de l'original el 12 novembre 2017. «Khayyam himself seems to have been the first to conceive a general theory of cubic equations.»
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; Robertson, E. F.«Omar Khayyam». School of Mathematics and Statistics, University of St Andrews. Arxivat de l'original el 12 novembre 2017. «Khayyam himself seems to have been the first to conceive a general theory of cubic equations.»