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3. G. B. Gurevich, Foundations of the Theory of Algebraic Invariants (Gostekhizdat, Moscow, 1948; P. Noordhoff, Groningen, 1964).
4. P. J. Olver, Classical Invariant Theory, in Ser.: London Mathematical Society Student Texts (Cambridge Univ. Press, Cambridge, 1999), Vol. 44.
5. E. Casas-Alvero, Analytic Projective Geometry, in Ser.: EMS Textbooks in Mathematics (European Mathematical Society, Zürich, 2014).