On Low Tree-Depth Decompositions
  The theory of sparse structures usually uses tree like structures as building blocks. In the context of sparse/dense dichotomy this role is played by graphs with bounded tree depth. In this paper we survey results related to this concept and particularly explain how these graphs are used to decompose and construct more complex graphs and structures. In more technical terms we survey some of the properties and applications of low tree depth decomposition of graphs. 
Jaroslav Nesetril (IUUK), Patrice Ossona De Mendez (IUUK, CAMS)
math.CO