See here the Call for papers for International Journal of Project Management Special issue: Actors, practices and strategy connections in multi-project management (Editors M. Martinsuo, J. Geraldi, T. Karrbom Gustavsson, J. Lampel). Proposal due date 15 Jan, 2019.
Call for papers
Special issue: Actors, practices and strategy connections in multi-project management, International Journal of Project Management