G. D. Chakerian, H. Groemer, Convex bodies of constant width, Convexity and its applications, 49-96, Birkhauser, Basel, 1983.
 L. Danzer, B. Gru¨nbaum, V. Klee, Hellys theorem and its relatives, in Proc. of Symp. in Pure Math. vol. VII, Convexity, 1963, pp. 99-180.
 B. Gonzalez Merino, T. Jahn, A. Polyanskii, G. Wachsmuth, Hunting for reduced polytopes, to appear in Discrete Comput. Geom. (see also arXiv:1701.08629v1).
 H. Hadwiger, Kleine Studie zur kombinatorischen Geometrie der Spha¨re, Nagoya Math. J. 8 (1955), 45-48.
 H. Han and T. Nishimura, Self-dual shapes and spherical convex bodies of constant width π/2, J. Math. Soc. Japan 69 (2017), 1475-1484.
 M. Lassak, Width of spherical convex bodies, Aequationes Math. 89 (2015), 555-567.
 M. Lassak, H. Martini, Reduced convex bodies in Euclidean space - a survey, Expositiones Math. 29 (2011), 204-219. [OpenAIRE]
 M. Lassak, M. Musielak, Reduced spherical convex bodies, to appear (see also arXiv:1607.00132v1).
 K. Leichtweiss, Curves of constant width in the non-Euclidean geometry, Abh. Math. Sem. Univ. Hamburg 75 (2005), 257-284.
 L. A. Santalo, Note on convex spherical curves, Bull. Amer. Math. Soc. 50 (1944), 528-534.
 I. M. Yaglom, V. G. Boltyanskij, Convex figures, Moscov 1951. (English translation: Holt, Rinehart and Winston, New York 1961).
 G. Van Brummelen, Heavenly mathematics. The forgotten art of spherical trigonometry. Princeton University Press (Princeton, 2013).