OPALPresentations.md

@@ -14,7 +14,7 @@
 1. [Towards quantitative simulations of high power proton cyclotrons](http://prst-ab.aps.org/pdf/PRSTAB/v14/i5/e054402)
 2. [Beam dynamics in high intensity cyclotrons including neighboring bunch effects: Model, implementation, and application]( http://prst-ab.aps.org/pdf/PRSTAB/v13/i6/e064201)
 3. [A fast parallel poisson solver on irregular domains applied to beam dynamic simulations](http://dx.doi.org/10.1016/j.jcp.2010.02.022)
-4.[Improvements of a fast parallel Poisson solver on irregular domains](http://dx.doi.org/10.1007/978-3-642-28151-8)
+4. [Improvements of a fast parallel Poisson solver on irregular domains](http://dx.doi.org/10.1007/978-3-642-28151-8)
 5. [A Fast and Scalable Low Dimensional Solver for Charged Particle Dynamics in large Particle Accelerators]( http://dx.doi.org/10.1007/s00450-012-0216-2)
 6. [A Parallel General Purpose Multi-Objective Optimization Framework, with Application to Beam Dynamics](http://arxiv.org/abs/1302.2889)
 7. [A novel adaptive time stepping variant of the Boris-Buneman integrator for the simulation of particle accelerators with space charge] (http://arxiv.org/abs/1211.3664)