The theory of infinite soluble groups por Lennox, John C., Robinson, Derek J. S.

Available for University of the Philippines Diliman via Oxford Scholarship Online. Click here to access:

The theory of infinite soluble groups por Lennox, John C., Robinson, Derek John Scott

Available for University of the Philippines System via Oxford Scholarship Online. Click here to access.

Finite soluble groups. por Doerk, Klaus

On products of normal supersoluble subgroups and generalisations por Perez, Edmundo R.

On equioptimal groups por Petalcorin, Gaudencio C. 1965-