Syarifuddin, Arief, 		Prastianto, Rudi, AND 		Silvianita, Silvianita.
" Numerical Study on the Fluid Forces of a Rigid Cylinder Covered by Helical Rods with Gap Due to the Variations of Incoming Flow Direction and Pitch at Reynolds Number 1000" <em>Journal of Ocean, Mechanical and Aerospace -science and engineering-</em> [Online], Volume 16 Number 1 (20 February 2015)