1. Bushnell, C.J., Reiner, I.: Zeta functions of arithmetic orders and Solomon's conjectures. Math. Z.173, 135?161 (1980).
2. Bushnell, C.J., Reiner, I.:L-functions of arithmetic orders and asymptotic distribution of ideals. J. Reine Angew. Math.,327, 156?183 (1981).
3. Comtet, L.: Advanced Combinatorics. Dordrecht: Reidel 1974
4. Curtis, C.W., Reiner, I.: Methods of Representation Theory, Vol. I. New York: Wiley, 1981
5. Drozd, Yu.A.: The distribution of maximal sublattices. Mat. Zametki,6, 19?24 (1969) [Russian]. Engl. Transl.: Math. Notes6, 469?471 (1969)