[1] T. Bonnesen and W. Fenchel, Theorie der konvexen Körper, Berlin 1934 and New York 1948.
[2] H. Busemann, The geometry of geodesics, New York 1955, quoted as G.
[3] H. Busemann, Convex surfaces, New York 1958.
[4] H. Busemann and J. K. Beem, Axioms for indefinite metrics, Rend. Circolo Mat. Palermo.
[5] A. S. Eddington, The mathematical theory of relativity, 2nd ed., Cambridge 1930.
[6] G. Ewald and C. A. Rogers, The faces of a convex body, Israel J. Math.
[7] P. Funk, Über Geometrien, bei denen die Geraden die Kürzesten sind, Math. Ann. 101 (1929), pp. 226-237.
[8] G. H. Hardy, J. E. Littlewood and G. Pólya, Inequalities, 2nd ed., Cambridge 1952.
[9} W. Hurewicz and H. Wallman, Dimension theory, Princeton 1941.
[10] S. Lie, Bestimmung aller Flächen, die eine kontinuirliche Schar von projektiven Transformationen gestatten, Ber. Sächs. Akad. Wiss. Leipzig 47 (1895), pp. 209-260.
[11] D. Montgomery and L. Zippin, Topological transformation groups, New York 1955.
[12] G. D. Mostow, The extensibility of local Lie groups of transformations and groups on surfaces, Ann. of Math. 52 (1950), pp. 606-636.
[13] T. Nagano, Differential geometry and analytic group theory methods in foundations of geometry, Algebraic and Topological Foundations of Geometry, Oxford 1962.
[14] L. Pontrjagin, Topological groups, Princeton 1939.
[15] И. М. Яглом, Б. А. Розенфельд и Е. У. Ясинская, Проективные метрики, Усп. Мат. Наук 19 выл. 5 (1964), стр. 51-113. English translation: I. M. Yaglom, B. A. Rozenfel’d and E. U. Yasinskaya, Projective metrics, Russ. Math. Surveys 19 (1964), No 5, pp. 49-107.