On computing optimal (Q, r) replenishment policies under quantity discounts - The all-units and incremental discount cases. - Michael N. Katehakis; Laurens C. Smit (Ann. Oper. Res., 2012)

A comparative analysis of the successive lumping and the lattice path counting algorithms. - Michael N. Katehakis; Laurens C. Smit; Floske Spieksma (J. Appl. Probab., 2016)