Distinguishing symplectic blowups of the complex projective plane
  A symplectic manifold that is obtained from the complex projective plane by k blowups is encoded by k+1 parameters: the size of the initial complex projective plane, and the sizes of the blowups. We determine which values of these parameters yield symplectomorphic manifolds. 
Yael Karshon and Liat Kessler
math.SG