1. IEA-Round Robin - Analysis of Straw and Straw Ashes, dk-TEKNIK;Nielsen,1992
2. Analysis of Straw and Straw Ashes. Part 1–4. dk-TEKNIK;Nielsen,1994
3. Interviews and literature Investigation of Burning- out Qualities and Formation of Slag Deposits;Jensen,1994
4. Ash from Cereal and Rape Straw used for Heat Production, Lining Effect, Plant Nutrient, and Heavy Metal content;Bringhammar,1994