Borel and Haefliger | K3 surfaces with involutions

Local and global Torelli theorems for complex K3 surfaces, periods of K3 surfaces, non-symplectic holomorphic involutions, anti-holomorphic involutions, Hilbert schemes of K3 surfaces, Nikulin's lattice theory, lattice-polarized K3 surfaces. . .

Borel and Haefliger

A. Borel, A. Haefliger,
{\it
La classe d'homologie fondamentale d'un espace analytique,}
Bull. Soc. Math. France {\bf 89} (1961), 461--513.