Some rigidity results for spatially closed spacetimes Gregory Galloway — 1997 Banach Center Publications
Some Results on the Occurrence of Compact Minimal Submanifolds. Gregory J. Galloway — 1981 Manuscripta mathematica
Stable Minimal Surfaces and Spatial Topology in General Relativity. Theodore Frankel; Gregory J. Galloway — 1982 Mathematische Zeitschrift