References
- De Medts, T., Tărnăuceanu, M. (2008). Finite groups determined by an inequality of the orders of their subgroups. Bull. Belg. Math. Soc. Simon Stevin 15:699–704.
- Schmidt, R. (1994). Subgroup Lattices of Groups. de Gruyter Expositions in Mathematics. Vol. 14. Berlin: de Gruyter.
- Suzuki, M. (1982/1986). Group Theory, I, II. Berlin: Springer-Verlag.
- Tărnăuceanu, M. (2006). Groups Determined by Posets of Subgroups. Bucureşti: Matrix Rom.