Jurnal Ilmiah Nasional Berita Biologi Volume 8 Nomor 5 Agustus 2007 : Proses Nitrifikasi Oleh Kultur Mikroba Penitrifikasi N-Sw dan Zeolit [ Nitrification by Mix Culture of Nitrifying Bacteria N-Sw and Zeolite ] - Hartati Imamuddin (Pusat Penelitian Biologi LIPI, 2007)