Bounds on Directed star arboricity in some digraph classes. - Henri Perret du Cray; Mourad Baïou; Laurent Beaudou; Vincent Limouzy (Electron. Notes Discret. Math., 2017)

Improved FPT algorithms for weighted independent set in bull-free graphs. - Henri Perret du Cray; Ignasi Sau (Discret. Math., 2018)