1. A. Derighetti, On the multipliers of a quotient group, Bull. Sci. Math. (2) 107 (1983), no. 1, 3–23.
2. A. Derighetti, Convolution operators on groups, Lecture Notes of the Unione Matematica Italiana, vol. 11, Springer, Heidelberg, UMI, Bologna, 2011.
3. J. Dixmier, $C^{*}$-Algebras, North-Holland Publishing Company, Amsterdam, 1977.
4. H. G. Feichtinger, On a class of convolution algebras of functions, Ann. Inst. Fourier (Grenoble) 27 (1977), 135–162.
5. H. G. Feichtinger, Banach convolution algebras of functions II, Monatsh. Math. 87 (1979), no. 3, 181–207.