1. S. L. Altmann, Rotations, Quaternions, and Double Groups, Clarendon Press, Oxford, 1986.
2. O. Barfield, What Coleridge Thought, Oxford University Press, London, 1972.
3. E. T. Bell, Men of Mathematics, Gollancz, London, 1937.
4. A. J. Booth, Saint-Simon and Saint-Simonism, a Chapter in the History of Socialism in France, Longmans, Green, Reader & Dyer, London, 1871.
5. Les groupes projectifs qui ne laissent invariante aucune multiplicité plane