4Frank Rogalla and Marie-Marguerite Bourbigot. New developments in complete nitrogen removal with biological aerated filters. Wat Sci Tech, 1990,22(1-2):273-280
5R.Pujol,H Lemmel and M Gousailles. A Key-point of nitrification in an up-flow bio-filtration reactor. Wat Sci Tech,1998,38(3):43-49
6A.T.Mann,T.Stephenson. Modeling biological aerated filters for wastewater treatment. Wat Res, 2000,51(10):2443-2448