The Cauchy problem for Lorentz metrics with prescribed Ricci curvature Dennis M. DeTurck — 1983 Compositio Mathematica
Existence of Metrics With Prescribed Ricci Curvature: Local Theory. Dennis M. DeTurck Inventiones mathematicae
Uniqueness and non-existence of metrics with prescribed Ricci curvature Dennis M. Deturck; Norihito Koiso — 1984 Annales de l'I.H.P. Analyse non linéaire
Some regularity theorems in riemannian geometry Dennis M. Deturck; Jerry L. Kazdan — 1981 Annales scientifiques de l'École Normale Supérieure