- H. W. Gollan and T. W. Ostermann, Operation of class sums on permutation modules, J. Symbolic Comput. 9 (1990), no. 1, 39–47.[MR]
- Holger W. Gollan, A new existence proof for Ly, the sporadic simple group of R. Lyons, J. Symbolic Comput. 31 (2001), no. 1-2, 203–209.[MR]