The laplacian on asymptotically flat manifolds and the specification of scalar curvature Murray Cantor; Dieter Brill — 1981 Compositio Mathematica
Maximizing properties of extremal surfaces in general relativity Dieter Brill; Frank Flaherty — 1978 Annales de l'I.H.P. Physique théorique
The initial value problem for closed universes Dieter R. Brill Séminaire Janet. Mécanique analytique et mécanique céleste