1. P. Barklund, 1989 : Occurrence and interaction between Gremmeniella abietina and endophytic fungi in two conifers . Ph. D. thesis, 1989 , SLU, Uppsala.
2. P. Barklund, 1990 : Gremmeniella abietina in Sweden: Historical background and symptomatology of the disease . Metsantutkimuslaitoksen tiedonantoja 360 (Bulletins of the Finnish Forest Research Institute 360).
3. Gremmeniella abietina (Scleroderris lagerbergii), a primary parasite in a Norway spruce die-back
4. Infection experiments with Gremmeniella abietina on seedlings of Norway spruce and Scots pine