1. Macaulay, "The Algebraic Theory of Modular Systems", Stechert Hafner Service Agency (Reprint), 1964.
2. Matsusaka, Memoirs of the College of Science, Univ. of Kyoto, Ser A, Vol. XXVI, 1950, p. 51–52.
3. Zariski, Samuel, "Commutative Algebra" Vol. II, Van Nostrand Company.