no. 4
On the purity of the branch locus
Compositio Mathematica, Tome 23 (1971) no. 4, pp. 461-465
corrigé par Correction to “On the purity of the branch locus” 
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Altman, Allen; Kleiman, Steven L. On the purity of the branch locus. Compositio Mathematica, Tome 23 (1971) no. 4, pp. 461-465. https://www.numdam.org/item/CM_1971__23_4_461_0/

A. Altman And S. Kleiman [1] Introduction to Grothendieck duality theory, Lecture Notes in Math. Vol. 146, Springer-Verlag, Berlin-Heidelberg -New York (1970). | Zbl | MR

A. Grothendieck [2 ] Appendix to Crystals and the De Rham Coh. of Sch., in Dix exposés sur la cohomologie des schémas, North-Holland Publ. Co., Amsterdam (1968). | Zbl

A. Grothendieck [3] "Sem de Geom. Alg. 2", North-Holland Publ. Co., Amsterdam (1968). Exposé X Theorem (3.4).

N. Katz [4] Nilpotent connections and the Monodromy Theorem Applications of a Result of Turrittin", in Sem. on Degeneration of Alg. Var., Inst. for Adv. Study, Princeton, New Jersey (1970). Remark 8.9.16.

O. Zariski [5] "On the purity of the branch locus of algebraic functions," Proc. Nat. Acad. Sci. U.S.A. 44 (1958), 791-796. | Zbl | MR