Einstein metrics and stability for flat connections on compact Hermitian manifolds, and a correspondence with Higgs operators in the surface case. Lübke, M. — 1999 Documenta Mathematica
Moduli Spaces of Simple Bundles and Hermitian-Einstein Connections. M. Lübke; C. Okonek — 1986 Mathematische Annalen
Stable bundles on regular elliptic surfaces. M. Lübke; C. Okonek — 1987 Journal für die reine und angewandte Mathematik