On $(P_5,\overline{P_5})$-sparse graphs and other families

We extend the notion of $P_4$-sparse graphs previously introduced by {\scshape Ho`ang} by considering $\mathcal{F}$-sparse graphs were $\mathcal{F}$ denotes a finite set of graphs on $p$ vertices. Thus we obtain some results on $(P_5,\overline{P_5})$-sparse graphs already known on $(P_5,\overline{P_5})$-free graphs. Finally we completely describe the structure of $(P_5,\overline{P_5},bull$)-sparse graphs, it follows that those graphs have bounded clique-width.