• 2019, juni. Public procurement of social care: from competitive contracting to ex post competition, Paper gepresenteerd op Global Revolution congres 2019, Nottingham.
  • 2019, april. In search for a ‘winning’ solution: relational contracting in a managed competition system, paper gepresenteerd op het IPSERA congres, Milaan.
  • 2019, april. Procurement practice for home care of Finnish and Dutch municipalities: a country comparison, paper gepresenteerd op het IPSERA congres, Milaan.
  • 2018, oktober. Municipal procurement of social care – opportunistic behaviour opportunities, paper gepresenteerd op het 4th Interdisciplinary Symposium on Public Procurement, Parijs.
  • 2018, oktober. Municipalities procuring youth care in the Netherlands: a proliferation of procurement methods?, paper gepresenteerd op het PhD-congres van de Universiteit van Nottingham, Nottingham.
  • 2017, juni. Non-intentional price differences, Paper gepresenteerd op het Global Revolution congres 2017, Nottingham. 
  • 2016. Conditions on lots, Practical desirability versus legal acceptability, in Gustavo Piga and Tünde Tatrai (Eds), Public Procurement Policy, New York/Abingdon, Oxon, Routhledge 2016, pp. 90-98