Citation: G. Freiling et al., Discussion on: 'Discrete-time Riccati equations in open-loop Nash and Stackelberg games' by G. Freiling, G. Jank and H. Abou-Kalldil - Final commentsby the authors G. Freiling, G. Jank and A. Abou-Kandil, EUR J CONTR, 5(1), 1999, pp. 68-69