Implementing software product portfolio management. - Erik Jagroep; Inge van de Weerd; Sjaak Brinkkemper; Ton Dobbe (IWSPM, 2011)

Framework for Implementing Product Portfolio Management in Software Business. - Erik Jagroep; Inge van de Weerd; Sjaak Brinkkemper; Ton Dobbe (Software Project Management in a Changing World, 2014)