Landscape as a Model: The Importance of Geometry. - E. Penelope Holland; James N. Aegerter; Calvin Dytham; Graham C. Smith (PLoS Comput. Biol., 2007)

Ora - Save the Forest! Designing a Social Impact Game. - Hazel Bradshaw; E. Penelope Holland; Mark Billinghurst (ICEC, 2014)