On the Pontrjagin-Viro form
arXiv:alg-geom/9705011
Abstract
A new invariant, the Pontrjagin-Viro form, of algebraic surfaces is introduced and studied. It is related to various Rokhlin-Guillou-Marin forms and generalizes Mikhalkin's complex separation. The form is calculated for all real Enriques surfaces for which it is well defined.
AMSTeX with amsppt and epsf.tex, 24 pages with 4 figures