1. Palais, R.: The classification of G-spaces, Amer. Math. Soc., 1960.
2. Harary, F.: Graph theory, Addison-Wesley, 1969.
3. Luna, D.: ‘Slices étales’, Bull. Soc. Math. France. 33 (1973), 81–105.
4. Luna, D.: ‘Adhérence d’orbite et invariants’, Invent. Math. 29, no. 3 (1975), 231–238.
5. Borel, A.: Linear algebraic groups, Benjamin, 1969.