Analytic approximations, perturbation theory, effective field theory   methods and their applications
  We summarize the parallel session B4: 'Analytic approximations, perturbation theory effective field theory methods and their applications' and the joint session B2/B4: 'Approximate solutions to Einstein equations: Methods and Applications', of the GR20 & Amaldi10 conference in Warsaw, July 2013. The contributed talks reported significant advances on various areas of research in gravity. 
Vitor Cardoso and Rafael A. Porto
gr-qc astro-ph.CO