1. E. Abbena, S. Garbiero, S. Salamon, Almost Hermitian geometry on the Iwasawa manifold. Ann. Scuola Norm. Sup. Pisa 30(1), 147–170 (2001)
2. B.S. Acharya, F. Denef, C. Hofman, N. Lambert, Freund-Rubin revisited. (2003). arXiv:hep-th/0308046
3. I. Agricola, S.G. Chiossi, T. Friedrich, J. Höll, Spinorial description of SU(3)- and G 2-manifolds. J. Geom. Phys. (2014). arXiv:1411.5663
4. D.V. Alekseevsky, Riemannian spaces with unusual holonomy groups. Funk. Anal. Prilozen 2, 1–10 (1968)
5. L. Antonyan, Classification of four-vectors of an eight-dimensional space. Trudy Sem. Vektor. Tenzor. Anal. 20, 144–161 (1981)