1. Witten, E.: On flux quantization in M theory and the effective action. J. Geom. Phys. 22, 1-13 (1997). arXiv:hep-th/9609122 [hep-th]. Collinucci, A., Savelli, R.: On Flux Quantization in F-Theory. JHEP 02, 015 (2012). arXiv:1011.6388 [hep-th]. Collinucci, A., Savelli, R.: On Flux Quantization in F-Theory II: Unitary and Symplectic Gauge Groups. JHEP 08, 094 (2012). arXiv:1203.4542 [hep-th]
2. Denef, F., Douglas, M.R., Florea, B., Grassi, A., Kachru, S.: Fixing all moduli in a simple f-theory compactification. Adv. Theor. Math. Phys. 9(6), 861–929 (2005). arXiv:hep-th/0503124 [hep-th]
3. Moore, G.W.: Strings and arithmetic. arXiv:hep-th/0401049 [hep-th]
4. DeWolfe, O., Giryavets, A., Kachru, S., Taylor, W.: Enumerating flux vacua with enhanced symmetries. JHEP 02, 037 (2005). arXiv:hep-th/0411061 [hep-th]
5. Kanno, K., Watari, T.: Revisiting arithmetic solutions to the $$W=0$$ condition. Phys. Rev. D96, 106001 (2017). arXiv:1705.05110 [hep-th]