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A. Pietsch, s-numbers of operators in Banach spaces, Studia Math. 51 (1974), 201–223, doi.

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A. Pietsch, Operator ideals, North-Holland Mathematical Library 20, North-Holland, 1980, doi.

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A. Pietsch, Eigenvalues and s-numbers, Cambridge Studies in Advanced Mathematics 13, Cambridge University Press, 1987, link.

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M. Ullrich, Inequalities between s-numbers, Adv. Oper. Theory 9 (2024), no. 4, article 82, doi, arxiv.

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M. Ullrich, On bounds between all s-numbers and widths of convex sets, preprint, 2026, arxiv.