greenfoot: combining object visualisation with interaction. - Poul Henriksen; Michael Kölling (OOPSLA Companion, 2004)

Opportunities and Challenges with J2SE 5 for Introductory Programming Teaching. - Michael Kölling; Poul Henriksen; Davin McCall; Bruce Quig; John Rosenberg (FECS, 2005)

Game programming in introductory courses with direct state manipulation. - Michael Kölling; Poul Henriksen (ITiCSE, 2005)

Greenfoot demonstration. - Poul Henriksen (ITiCSE, 2006)

Flexible, reusable tools for studying novice programmers. - Matthew C. Jadud; Poul Henriksen (ICER, 2009)

Motivating programmers via an online community. - Poul Henriksen; Michael Kölling; Davin McCall (J. Comput. Sci. Coll., 2010)