Zariski, Oscar (1958). «Introduction to the Problem of Minimal Models in the Theory of Algebraic Surfaces». American Journal of Mathematics80: 146-184. JSTOR2372827. doi:10.2307/2372827.
Nagata, Masayoshi (1958). «Existence theorems for nonprojective complete algebraic varieties». Illinois J. Math.2: 490-498. doi:10.1215/ijm/1255454111.
Zariski, Oscar (1958). «Introduction to the Problem of Minimal Models in the Theory of Algebraic Surfaces». American Journal of Mathematics80: 146-184. JSTOR2372827. doi:10.2307/2372827.