1. Powder diffraction file,1987
2. Anaerobic bacterial aggregates: variety and variation;Beeftink,1987
3. Elements of X-Ray Diffraction;Cullity,1956
4. Microbiological aspects of granular methanogenic sludge;Dolfing,1987
5. Effect of calcium removal on size and strength of methanogenic granules;Grotenhuis,1988