Zuraifah Minhat, Muhammad Syukri Abd Rahaman, Mohd Sobri Takriff and Norhisham Tan Kofli.  (2015).  Carbon Dioxide Sequestration by Locally Isolated and Commercial Strain of Microalgae.  - JOURNAL OF PURE AND APPLIED MICROBIOLOGY.  539-543. 

Hassimi Abu Hasan, Siti Rozaimah Sheikh Abdullah, Siti Kartom Kamarudin, Noorhisham Tan Kofli.  (2013).  On-off control of aeration time in the simultaneous removal of ammonia and manganese using a biological aerated filter system.  - Process Safety and Environmental Protection.  91:415-422. 

Hassimi Abu Hasan, Siti Rozaimah Sheikh Abdullah, Noorhisham Tan Kofli, Siti Kartom Kamarudin.  (2012).  Removal of NH4+-N ion in drinking water treatment using locally isolated heterotrophic nitrifier.  - Desalination and Water Treatment.  50:294-301. 

Hassimi Abu Hasan, Siti Rozaimah Sheikh Abdullah, Siti Kartom Kamarudin, Noorhisham Tan Kofli.  (2011).  Effect Of Organic Carbon Loading (OCL) On Simultaneous NH4+-N AND Mn2+ Removal In Drinking Water Using A Baf System.  - Environmental Engineering and Management Journal.  10(11):1733-1742.