1. in Proc. Eur. Symp. Anaerobic Waste Water Treatment. (Noordwijkerhout, The Netherlands. 1983) p. 259.
2. and in Proc. Water Treatment Conference AQUATECH '86 (Amsterdam, 1986) p. 161.
3. and in Proc. Water Treatment Conference AQUATECH '86 (Amsterdam, 1986) p. 297.
4. in Proc. Water Treatment Conference AQUATECH '86 (Amsterdam, 1986) p. 669.
5. Granulation in UASB Reactors