1. Alexeev, V., Brion, M.: Moduli of affine schemes with reductive group action. J. Algebr. Geom. 14, 83–117 (2005)
2. Brion, M.: Invariant Hilbert schemes. In: Farkas, G., Morrison, I. (eds.) Handbook of Moduli. Advanced Lectures in Mathematics (ALM) 24, vol. 1, pp. 64–117. International Press, Somerville, MA (2013)
3. Casnati, G., Notari, R.: On the Gorenstein locus of some punctual Hilbert schemes. J. Pure Appl. Algebra 213, 2055–2074 (2009)
4. Drézet, J-M.: Luna’s slice theorem and applications. In: Wisniewski, JA. (ed.) Algebraic Group Actions and Quotients, pp. 39–89. Hindawi Publ. Corp., Cairo (2004)
5. Fogarty, J.: Algebraic families on an algebraic surface. Am. J. Math. 13(2), 511–521 (1968)