End-of-life service: A case study. - Ruud H. Teunter; Leonard Fortuin (Eur. J. Oper. Res., 1998)

Operational research in practice: Consultancy in industry revisited. - Leonard Fortuin; Mynt Zijlstra (Eur. J. Oper. Res., 2000)

Designing a performance measurement system: A case study. - Clemens Lohman; Leonard Fortuin; Marc Wouters (Eur. J. Oper. Res., 2004)