1. Alcántara, C.R.: Singular points and automorphisms of unstable foliations of $$\mathbb{C}\mathbb{P} ^2$$. Bol. Soc. Mat. Mexicana3 16(1), 39–51 (2010)
2. Barth, Wolf P., Hulek, Kaus Chris Peters, A.M., Van de Ven, A.: Compact complex surfaces, vol. 4 of Ergebnisse der Mathematik und ihrer Grenzgebiete. 3. Folge. A Series of Modern Surveys in Mathematics [Results in Mathematics and Related Areas. 3rd Series. A Series of Modern Surveys in Mathematics]. Springer-Verlag, Berlin, second edition, (2004)
3. Beauville, A.: Le nombre minimum de fibres singulières d’une courbe stable sur $${\mathbb{P}}^1$$. Astérisque, 86:97–108, (1981). Seminar on pencils of curves of genus at least two
4. Beauville, A.: Complex algebraic surfaces, vol. 34 of London Mathematical Society Student Texts. Cambridge University Press, Cambridge, second edition, Translated from the 1978 French original by R. Barlow, with assistance from N. I. Shepherd-Barron and M. Reid (1996)
5. Brunella, M.: Birational geometry of foliations. Publicações Matemáticas do IMPA. [IMPA Mathematical Publications]. Instituto de Matemática Pura e Aplicada (IMPA), Rio de Janeiro, (2004)