11 Acknowledgments
It is a great pleasure to thank Silvano Bonazzola, Alessandra Buonanno, Thibault Damour, Jürgen
Ehlers, Gilles Esposito-Farèse, Guillaume Faye, Eric Gourgoulhon, Bala Iyer, Sergei Kopeikin, Misao
Sasaki, Gerhard Schäfer, Bernd Schmidt, Kip Thorne, and Clifford Will for interesting discussions and/or
collaborations.