1. Aubin, T.: Équations différentielles non linéaires et problème de Yamabe concernant la courbure scalaire. J. Math. Pures Appl. 9(55), 269–296 (1976)
2. Auslander, L.: An exposition of the structure of solvmanifolds. Part I: algebraic theory. Bull. Am. Math. Soc. 79(2), 227–261 (1973)
3. Besse, A.L.: Einstein Manifolds. Springer, Berlin (2007)
4. Bogomolov, F.: Classification of surfaces of class VII0 with b2 = 0. Math. USSR-Izvestija 10(2), 255–269 (1976)
5. Bogomolov, F.: Surfaces of class VII0 and affine geometry. Izvestiya Rossiiskoi Akademii Nauk. Seriya Matematicheskaya 46(4), 710–761 (1982)