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Nakai, Yoshikazu (1961), “On the theory of differentials in commutative rings”, 《Journal of the Mathematical Society of Japan》 13: 63–84, doi:10.2969/jmsj/01310063, MR0125131.
Schreiner, Achim (1994), “On a conjecture of Nakai”, 《Archiv der Mathematik》 62 (6): 506–512, doi:10.1007/BF01193737, MR1274105
Schreiner, Achim (1994), “On a conjecture of Nakai”, 《Archiv der Mathematik》 62 (6): 506–512, doi:10.1007/BF01193737, MR1274105