1. M. Artin,Some numerical criteria for contractibility of curves on an algebraic surface, Am. J. Math.,84 (1962), pp. 485–496.
2. L. Badescu,Suprafete Algebrice, Ed. Academiei, Bucharest (1981).
3. L. Badescu,Algebra graduata asociata unui divizor pe o suprafata neteda si proiectiva, inAnaliza Complexa, aspecte clasice si moderne, Ed. St. si Encicl. Bucharest (1988), pp. 295–337.
4. L. Badescu,Hyperplane sections and deformations, inProc. of Week of Algebraic Geometry, Bucharest 1982, Lectures Notes in Math.,1056 (1984), pp. 1–33.
5. A. Beauville,Surfaces algebriques complexes, Asterisque,54 (1978).