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46K99 None of the above, but in this section (3 articles)

• Beckhoff, Ferdinand: Korovkin theory in Banach $^*$-algebras. (English). Mathematica Slovaca, vol. 43 (1993), issue 5, pp. 631-642
• Pumplün, Dieter; Röhrl, Helmut: Totally convex algebras. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 33 (1992), issue 2, pp. 205-235
• Hofmann, Gerald: Characterization of the extremal rays of the cones of positive elements in tensor algebras. (English). In: Frolík, Zdeněk (ed.): Proceedings of the 10th Winter School on Abstract Analysis. Circolo Matematico di Palermo, Palermo, 1982. pp. [135]-145