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, MR 0125131. /wiki/Doi_(identifier)
Schreiner, Achim (1994), "On a conjecture of Nakai", Archiv der Mathematik, 62 (6): 506–512, doi:10.1007/BF01193737, MR 1274105. Schreiner cites this converse to EGA 16.11.2. /wiki/Archiv_der_Mathematik
Mount, Kenneth R.; Villamayor, O. E. (1973), "On a conjecture of Y. Nakai", Osaka Journal of Mathematics, 10: 325–327, MR 0327731. /wiki/MR_(identifier)
Schreiner, Achim (1994), "On a conjecture of Nakai", Archiv der Mathematik, 62 (6): 506–512, doi:10.1007/BF01193737, MR 1274105. /wiki/Archiv_der_Mathematik
Becker, Joseph (1977), "Higher derivations and the Zariski-Lipman conjecture", Several complex variables (Proc. Sympos. Pure Math., Vol. XXX, Part 1, Williams Coll., Williamstown, Mass., 1975), Providence, R. I.: American Mathematical Society, pp. 3–10, MR 0444654. /wiki/American_Mathematical_Society