Differentiation in Freemium: Where Does the Line Lie? - Davide Semenzin; Edwin Meulendijks; Wilbert Seele; Christoph Wagner; Sjaak Brinkkemper (ICSOB, 2012)

What Concerns Users of Medical Apps? Exploring Non-Functional Requirements of Medical Mobile Applications. - Michiel Meulendijk; Edwin Meulendijks; Paul Jansen; Mattijs E. Numans; Marco R. Spruit (ECIS, 2014)