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2. Herbert Goldstein, Classical Mechanics, 2nd edn, Addison-Wesley, Menlo-Park, California, 1980.
3. Dan Kaiman, The axis of rotation: analysis, algebra, geometry, Math. Mag. 62 (1989) 248–252.
4. Helmut Karzel, Inzidenzgruppen I, lecture notes by I. Pieper and K. Sörensen, Univ. Hamburg 1965, pp. 123-135.
5. William Kerby, On Infinite Sharply Multiply Transitive Groups, Hamburger Mathematische Einelschriften, Neue Folge, Heft 6. Vandenhoek und Ruprecht, Göttingen 1974.