On the universal coverings of algebraic surfaces

Katzarkov, L.; Ramachandran, M.

Annales scientifiques de l'École Normale Supérieure, Volume 31 (1998) p. 525-535

Stable $G_2$ bundles and algebraically completely integrable systems

Katzarkov, L.; Pantev, T.

Compositio Mathematica, Volume 92 (1994) p. 43-60