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81E13 

• Corrigan, E.: Some comments on a cubic algebra. (English). In: Frolík, Z., Souček, V. and Vinárek, J. (eds.): Proceedings of the Winter School "Geometry and Physics". Circolo Matematico di Palermo, Palermo, 1985. pp. [43]-52
• Dittrich, Jaroslav: On the topological charge conservation in the three-dimensional ${\rm O}(3)$ $\sigma$-model. (English). Aplikace matematiky, vol. 29 (1984), issue 5, pp. 367-371
• Corrigan, E.; Goddard, P.: Instantons. (English). In: Frolík, Z. (ed.): Abstracta. 8th Winter School on Abstract Analysis. Czechoslovak Academy of Sciences, Praha, 1980. pp. 44-56