Isenberg, James; Moncrief, Vincent (1994), Flato, M.; Kerner, R.; Lichnerowicz, A. (eds.), "Some Results on non Constant Mean Curvature Solutions of the Einstein Constraint Equations", Physics on Manifolds: Proceedings of the International Colloquium in honour of Yvonne Choquet-Bruhat, Paris, June 3–5, 1992, Mathematical Physics Studies, Dordrecht: Springer Netherlands, pp. 295–302, doi:10.1007/978-94-011-1938-2_21, ISBN978-94-011-1938-2