References
- Burkett, S., Lamar, J., Lewis, M. L., Wynn, C. (2017). Groups with exactly two supercharacter theories. Commun. Algebra 45(3):977–982. DOI: 10.1080/00927872.2016.1172622.
- Chen, X., Lewis, M. L. Groups with one or two super-Brauer character theories. https://arxiv.org/abs/1703.00065v1.
- Diaconis, P., Isaacs, I. M. (2008). Supercharacters and superclasses for algebra groups. Trans. Amer. Math. Soc. 360(5):2359–2392. DOI: 10.1090/S0002-9947-07-04365-6.
- Haggarty, R. J., Humphreys, J. F. (1978). Projective characters of finite groups. Proc. London Math. Soc. 36(3):176–192. DOI: 10.1112/plms/s3-36.1.176.
- Higgs, R. J. (1988). Groups with two projective characters. Math. Proc. Camb. Phil. Soc. 103(1):5–14. DOI: 10.1017/S0305004100064562.
- Higgs, R. J. (1989). Projective characters of degree one and the inflation-restriction sequence. J. Aust. Math. Soc. A. 46(2):272–280. DOI: 10.1017/S1446788700030731.
- Higgs, R. J. (1990). Subgroups of the Schur multiplier. J. Aust. Math. Soc. A. 48(3):497–505. DOI: 10.1017/S1446788700030019.
- Higgs, R. J. (1998). Projective characters of odd degree. Commun. Algebra 26(10):3133–3140. DOI: 10.1080/00927879808826332.
- Higgs, R. J. (2001). Projective representations of abelian groups. J. Algebra 242(2):769–781. DOI: 10.1006/jabr.2000.8751.
- Howlett, R. B., Isaacs, I. M. (1982). On groups of central type. Math. Z. 179(4):555–569. DOI: 10.1007/BF01215066.
- Isaacs, I. M. (1976). Character Theory of Finite Groups. New York: Academic.
- Karpilovsky, G. (1993). Group Representations. Vol. 2. Amsterdam: North-Holland.
- Karpilovsky, G. (1994). Group Representations. Vol. 3. Amsterdam: North-Holland.
- Liebeck, M. W., O'Brien, E. A., Shalev, A., Tiep, P. H. (2011). Commutators in finite quasisimple groups. Bull. Lond. Math. Soc. 43(6):1079–1092. DOI: 10.1112/blms/bdr043.
- Mackey, G. W. (1958). Unitary representations of group extensions. I. Acta Math. 99:265–311. DOI: 10.1007/BF02392428.
- Mangold, R. (1966). Beiträge zur Theorie der Darstellungen endlicher Gruppen durch Kollineationen. Mitt. Math. Sem. Giessen. 69:44. ii+
- Schur, I. (1907). Untersuchungen über die Darstellung der endlichen Gruppen durch gebrochene lineare Substitutionen. J. Reine Angew. Math. 132:85–137.