1. Altman, A., Kleiman, S.L.: On the purity of the branch locus. Comp. Math. 23(4), 461–465 (1971)
2. Altman, A., Kleiman, S.L.: Correction to “On the purity of the branch locus”. Comp. Math. 26(3), 175–180 (1973)
3. Atiyah, M.F., Macdonald, I.G.: Introduction to commutative algebra. Addison-Wesley, Mass (1969)
4. Bădescu, L.: Infinitesimal deformations of negative weights and hyperplane sections. Algebraic geometry (L’Aquila, : 1–22. Lecture Notes in Math, vol. 1417. Springer, Berlin (1988)
5. Bădescu, L.: On a criterion for hyperplane sections. Math. Proc. Camb. Phil. Soc. 103, 59–67 (1988)