A canonical construction yielding a global view of twistor theory. Douglas, Roy R. (1996) Mathematical Physics Electronic Journal [electronic only]
A Kummer-type construction of self-dual 4-manifolds. Claude LeBrun, Michael Singer (1994) Mathematische Annalen
Algebraic dimension of twistor spaces and scalar curvature of anti-self-dual metrics. Massimiliano Pontecorvo (1991) Mathematische Annalen