Maximal Symplectic packings of $\P^2$
  In this paper we describe the intersection between the balls of maximal symplectic packings of $\P^2$. This analysis shows the existence of singular points for maximal packings of $\P^2$ by more than three equal balls. It also yields a construction of a class of very regular examples of maximal packings by five balls. 
Emmanuel Opshtein